Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e74d80bafca9ad…

MALICIOUS

PDF

71.9 KB Created: 2020-10-28 07:41:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 976c87291e408ca7502e889249781e19 SHA-1: 3c586e2f0a3857df8d67f9b56947a0b24567e29f SHA-256: 76e74d80bafca9ad86651285951a9b1fc69bde93a1aeef8d20400c4c4ee62936
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a malicious redirector, specifically linking to `https://ttraff.ru/123?keyword=badgering+the+witness+rule`. The document body, though heavily obfuscated, also contains this URL. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt to drive traffic to malicious infrastructure.

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.
  • 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.ru/123?keyword=badgering+the+witness+rule In PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/eba0be3fd679f.pdfIn PDF document text
    • https://rafunukogavukuj.weebly.com/uploads/1/3/3/9/133999746/1425148.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/2894ae9edf7b195.pdfIn PDF document text
    • https://sapakokejepudig.weebly.com/uploads/1/3/4/4/134457578/mamokifisixusakel.pdfIn PDF document text
    • https://derodaju.weebly.com/uploads/1/3/1/6/131606282/38b26bf5443.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/c8a99e22f00ab6.pdfIn PDF document text
    • https://zazokovorif.weebly.com/uploads/1/3/4/3/134321981/ae41f5f86f004d.pdfIn 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/1/0430/1117/8649/files/78186647670.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9548/2261/files/the_course_ed_miller_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3729/7304/files/google_bildersuche_umgekehrt_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1761/4998/files/how_to_find_the_main_contention_of_an_article.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3826/8318/files/play_store_download_apk_for_jio_phone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8885/2632/files/rosate_360_mixing_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7922/7805/files/78523071260.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/0351/1445/files/26880363204.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8150/8022/files/field_hockey_goalie_helmet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1966/3522/files/class_c_amplifier_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9bd4ad5-35ac-4395-bc88-a62cf190b157/valig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d58991ca-5185-4dcd-bf60-13b3ae611a81/34357072037.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6e97d43-ab38-4940-8f1b-aa625b0e9c67/89873592674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f41de8d7-da57-4640-a8d9-faecf04fa438/vunazegasazipezagavej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81fa83e6-a34d-4cc6-8768-ce6c943b856a/rabananipimiku.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_off0000da8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 5228 bytes
SHA-256: 2295b0c3d1d3da3529c534e051ba88518c4f3580b19bb5a9844b6899aacc9ac7
font_01_sfnt_off0000ec56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 11008 bytes
SHA-256: 7a8e6aa078285cf6094323942ba3e5d7320b68eaf0095b2caad32fc2cc9c4e1d