Malicious PDF — malware analysis report

Static analysis result for SHA-256 a339975028dbf2a8…

MALICIOUS

PDF

73.1 KB Created: 2020-12-20 10:36:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5838f51fcff2831d7a13b4bbbd1a1e5a SHA-1: 9aa7e508f2cb82ca04f531e386e7724422af0572 SHA-256: a339975028dbf2a83d29eb2c0164ee6f6833bf0e434ea71e60cbb6425e7117e4
76 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a malicious document, specifically using an SEO redirector for a 'free-download phishing' lure. The embedded URL `https://trafffe.ru/strik?utm_term=else+if+c%252B%252B` is identified as the primary malicious indicator. While no scripts were explicitly extracted, the nature of the redirector suggests an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/strik?utm_term=else+if+c%252B%252B PDF link annotation
    • https://wovukevaz.weebly.com/uploads/1/3/4/5/134523328/titik-bebusatosuwawe-tesam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406216/normal_5f979922c8af4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483365/normal_5faf706b2f932.pdfIn PDF document text
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/musosubepe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447095/normal_5fbca5b16d3d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451355/normal_5fce31782d77b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_5fa63d1c59b08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378604/normal_5f95f10cba8b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c25fec2b-90df-4d19-9231-7840a0ba24c3/larry_wheels_program_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/412bdfd7-3a91-477b-ac55-644e380882fc/90947893298.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdcb8173599a867de449200/t/5fdcf2c990d688540a59b184/1608315594767/fataledilonijal.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc284201c8c7413143c29cf/t/5fcb1f849708706f39965abb/1607147396833/98539826482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0566a80-1ee8-4116-bc10-b807b7fe831e/zogepokenogibajove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea4dda4b-e662-44d9-b91e-9fbc91b673fd/64242507641.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5bd940b6b03258f567eb7/t/5fc8112da32400439af8a661/1606947117659/penguins_dibble_dash_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4635c429-2beb-48d4-869f-685c00c390d2/snap_tube_for_iphone.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C6 4528 bytes
SHA-256: 6bcb1d9712f4dd0d12e7e2422e9574559c7b64554d89c3b423c399691f243343
font_01_sfnt_off0000f34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34B 10700 bytes
SHA-256: 0daa406764e47eedc69b7e45b519a3c1e00fc4a227f7a082a838885800d618a6

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