Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf64683b47c47b65…

MALICIOUS

PDF

48.7 KB Created: 2020-10-31 16:39:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 71f1b34369837161b5af4e8e06d4e944 SHA-1: 45f3c3fe9ea2ae807f8d1823c7e828475ead78f4 SHA-256: cf64683b47c47b65c3ffefc9e2190530dcbfad5362b18cd62f7ff9a90813e11e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which lead to disposable hosting or known malicious redirectors. The ML classifier strongly indicated maliciousness, and the presence of a link to a known malicious redirector at 'https://cctraff.ru/123?keyword=abdomen+agudo+slideshare' further supports this. The document body appears to be obfuscated or corrupted, but the embedded URLs are the primary indicators of malicious intent.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/123?keyword=abdomen+agudo+slideshare In PDF document text
    • https://nujidigazinuwag.weebly.com/uploads/1/3/4/3/134318548/majusu.pdfIn PDF document text
    • https://seranogi.weebly.com/uploads/1/3/4/2/134265977/b90d3bec8b98fcf.pdfIn PDF document text
    • https://baresifesej.weebly.com/uploads/1/3/4/1/134131831/5848236.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378608/normal_5f99642231620.pdfIn PDF document text
    • https://dosedupuwosiwoz.weebly.com/uploads/1/3/0/7/130776272/23483328b.pdfIn PDF document text
    • https://vogizezadu.weebly.com/uploads/1/3/0/8/130814341/3791286.pdfIn PDF document text
    • https://laxuruvu.weebly.com/uploads/1/3/1/4/131482832/6826984.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/5551592.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/3190f241-9975-433c-b828-bb1ec7f8b657/lexisimiwozunevajawil.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/24055055931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9c298ed-0780-46e2-a950-4e92c0eeb205/roxodasozatu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/6127/9423/files/deezer_crack_premium_plus.apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/2683/1300/files/arcade_stick_pc_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d91cdb2d-bfbe-409a-8cba-cb31692f83a8/80276849960.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7603 1644 bytes
SHA-256: 37c24baa18d0073ec8030c3588704cc78396206b8b2b974af8757a8904f74525
font_01_sfnt_off00007e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E3E 5368 bytes
SHA-256: 2e1d11c4213e770a270194118f3d3cac2364a61b09abeb79b164b817d4e496af
font_02_sfnt_off00009048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9048 11260 bytes
SHA-256: a231b42d572dab28c97b207c7a9a52a19b1bdde1f9d60d59aacbd8b53e0b5d43

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