Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ef4670732f60fa…

MALICIOUS

PDF

55.4 KB Created: 2020-10-25 07:25:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: a2dedb7a00d22e460e26f26dae126be7 SHA-1: 77a405553c6c8118e924e1d06aebcdb7c31fbb5c SHA-256: 81ef4670732f60fa9d5e3718f51a8ae0855a2a565e0611a4af78d8bddb9f0466
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.me/aws?keyword=general+mental+ability+and+reasoning+pdf+in+telugu In PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/xafetezotel.pdfIn PDF document text
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/2f282aa5a56.pdfIn PDF document text
    • https://pativezakuzorad.weebly.com/uploads/1/3/4/2/134266084/9819475.pdfIn PDF document text
    • https://sakeneri.weebly.com/uploads/1/3/4/3/134339958/damasutewiluxafanoto.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/fa2adb4e.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00005364.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00005364.bin)
    • http://fedorahosted.org/lohitIn extracted file (font_01_sfnt_off00006674.bin)
    • https://cdn.shopify.com/s/files/1/0504/4276/4457/files/86380779859.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5849/0275/files/chemical_hygiene_plan_definition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/0900/4952/files/ragir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/7992/3365/files/falixudukazezeki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1783/6950/files/saronubuligev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18c49804-6fbb-464c-9eb2-6458355cb30c/virotulitupuluxido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7f400db-0a92-4a5e-b074-698a34cd7f67/nuribelosajigisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06fedb17-ee68-4068-9386-72dd0cc91a82/codigos_sagrados_numericos_para_el_amor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23df9984-566c-4e1f-b18c-d4740138309b/64072363243.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53569cb1-328c-4234-bfad-de9a776acbe6/jizasagodi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0890/0768/files/1266900988.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/8669/4550/files/fezetosetuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/7248/3228/files/the_dismal_descent_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/2615/5173/files/rurixisib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4649/3605/files/face_id_android_studio.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2573/4552/files/34689452159.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7916/2263/files/big_pun_death.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4169/2580/files/51070188297.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7682/0890/files/environmental_engineering_mcq_book.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn extracted file (font_00_sfnt_off00005364.bin)
    • http://dejavu.sourceforge.netIn extracted file (font_03_sfnt_off0000ba15.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_03_sfnt_off0000ba15.bin)

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5364 5632 bytes
SHA-256: a537d0b3ad9d6822a3c3b714160f4da8486ac1bae2b7e66b02789f75dd0dc727
font_01_sfnt_off00006674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6674 19212 bytes
SHA-256: 37edea7d082eed8fe2fa6e0a2c9843f1cd64f7f372bcb4b608ce06c692cfc33d
font_02_sfnt_off000095c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95C0 10628 bytes
SHA-256: f828d479768567d7afc540d53f4b0fdb3031aa10f2bd402ade3eccc841658023
font_03_sfnt_off0000ba15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA15 16164 bytes
SHA-256: ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1