Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1eef8d3773bd53…

MALICIOUS

PDF

43.1 KB Created: 2020-08-03 10:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b5c03f07a17673390d1ce41a96d2a78 SHA-1: 38ca1b61c48131cacc0df3d77aa3309f0995ff28 SHA-256: 0f1eef8d3773bd53c59177da341f2527c8f2635f7209258bb1b3ea4528a405d1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with a primary redirector to 'ttraff.ru', indicating a malicious intent to direct users to potentially harmful content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests an attempt to distribute or phish. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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=hbr+guide+to+project+management+pdf+download
    • http://files.savoyfoundation-usa.org/uploads/1/3/1/3/131379719/subiza.pdf
    • http://files.beejaysenglish.com/uploads/1/3/2/8/132814071/9463615.pdf
    • http://files.karengolland.com/uploads/1/3/0/9/130969809/jurimes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6288/6549/files/91972902869.pdf
    • https://cdn.shopify.com/s/files/1/0437/3600/6817/files/72564414252.pdf
    • https://cdn.shopify.com/s/files/1/0434/1851/7665/files/gezerub.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5018/files/nekisanugipozujoferixaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/8082/7558/files/43149038628.pdf
    • https://cdn.shopify.com/s/files/1/0434/4968/0028/files/subarukopisodagupe.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0820/files/86113660488.pdf
    • https://cdn.shopify.com/s/files/1/0437/8837/0072/files/79268503838.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8333/files/fixevanomepakowimoziti.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0694/files/vizavemetujunesukup.pdf
    • https://cdn.shopify.com/s/files/1/0435/8114/5243/files/debut_video_capture_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/front_sight_training_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0427/4572/5094/files/lowojapamix.pdf
    • https://cdn.shopify.com/s/files/1/0436/1424/0931/files/what_is_memory_leak.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066ca.bin
de20428a760adc63ff710b4849e1ee94327e46cb48de8d66021e30cf6c2b1347		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66CA 5568 bytes
font_01_sfnt_off000079b9.bin
46e7d7d3db148fc61ddb8cdb50e72a9afabcd08124b87afb4919332ba48df9df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B9 10888 bytes

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