Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94b81663c7d294d…

MALICIOUS

PDF

45.8 KB Created: 2020-10-29 04:22:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c5709f8c5f70be96b3caee566845ac96 SHA-1: 12540bfdafe4f7191efef139f5b540e2b2795fa7 SHA-256: a94b81663c7d294db6e2ee082df5301ca3b48ffd4fd13d96e15be55d34b68762
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, which is designed to lead users to malicious content. The document body, though heavily obfuscated, contains the URL that is also referenced by the PDF_SEO_LINK_FARM heuristic. This suggests a phishing or scam attempt leveraging a link farm to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=death+run+3d+hacked In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370267/normal_5f8d46d11e522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367674/normal_5f87f7a75091d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405413/normal_5f968b3c31daa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383327/normal_5f8db6f87a30c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405420/normal_5f9a0a1544e8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393502/normal_5f8fa2345d383.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385230/normal_5f8f24fa9e589.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/1/0496/5990/4157/files/xijunodenexusub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8aaafff-f88e-4f90-81f9-6d10d50424fb/gaxasinukusowuzabikobep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/749ac2ef-b523-416b-bb7c-a75e33d66b81/61334062208.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6467/0873/files/73317564949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e968511f-a9bf-466a-88c2-9b95a0da731a/60093125107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef77f12f-947b-4e5f-a035-fdffd48ac31e/84972489840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b2eea09-633c-4494-9e17-054984c395e0/mitobiwuroz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/7168/5027/files/teddy_bear_template_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ab60a01-5c7f-4242-8878-4e0d6c1d4261/persepolis_1_and_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2484/3420/files/where_to_find_lascaux_borderlands_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef888abf-8c3a-4492-b1e2-d41d640895d4/51033565843.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74075dca-d946-4b77-b0c8-2f94f01c594c/vupog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/6309/0591/files/george_edward_moore_principia_ethica.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2006/1341/files/art_van_clearance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7d302b9-48ed-4e3f-8a40-dcb8835322da/15328068548.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1653/3654/files/89625717976.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/2417/7093/files/53258846767.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_off00007619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7619 5044 bytes
SHA-256: 20aaeacf2f45ee19f083f3efecf2633e84e67e9d8d92bfd78a9e36e37cd1950c
font_01_sfnt_off00008741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8741 10160 bytes
SHA-256: df6ea9877dd908b64d8c0e27c51bf73a922dcea852b377017449a534d1c040c0

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