Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70bfce79003cc22…

MALICIOUS

PDF

49.3 KB Created: 2020-10-08 02:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 780e8f89d50d76e51de9dab263b95705 SHA-1: b7469d366d41563827ee8df6ff78acaa2de72ba2 SHA-256: c70bfce79003cc22b2dfd5ae25e05836758ac19fb27f7b0056b913f3508945f5
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a malicious redirector URL, disguised as a download for a book series. The primary malicious URL identified is https://ttraff.ru/pify?keyword=a+series+of+unfortunate+events+books+1-13+download+pdf, which is known to lead to malicious infrastructure. The document body also contains numerous links to other PDFs hosted on various platforms, likely for SEO manipulation or to obscure the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/pify?keyword=a+series+of+unfortunate+events+books+1-13+download+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1860/7521/files/energy_transfer_san_antonio_careers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5575/4649/files/95427974619.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8979/6513/files/gather_together_in_my_name_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5584b23a-91af-438d-8d42-5e691ad7fedb/8833840539.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/7554/5509/files/a_love_to_last_april_30_zodiac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/31293452767.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/5470/3004/files/29726847931.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/los_protocolos_de_los_sabios_de_sion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2535/0301/files/49.5_cm_into_inches.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/489956c6-ddc4-4cf7-b40d-f3f3ea454911/71548354864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62408164-3628-4fc3-a9b4-2801f7799060/57522442728.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2383970c-ac4e-4e5c-8c93-966d71bd1b7b/donomexefufopekov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee3d668a-3799-4800-bcea-cd573dd07eac/74762144590.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5743c2d-e7a6-4043-8719-528316fea558/61101267903.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 PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7572 5628 bytes
SHA-256: d0d41ffb8537f817a76e2acf44f5a2cb218e003f0da38c32f1952ed89ee66074
font_01_sfnt_off000088c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88C8 15372 bytes
SHA-256: 27e41ec653559e3d0241bc9ff8dc2e018a7ce8eb40b4af7f4f84f8837e7b2bce

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