Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c127798ceee2c4…

MALICIOUS

PDF

41.6 KB Created: 2020-08-12 02:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e093c60f5a550b1252efc14e670ddd06 SHA-1: 7639038f64ed5066a03075e7899caacf80ab5337 SHA-256: 15c127798ceee2c40ad4faa10a85f378377fe1a5609fb1ba1568ce55d671f6ed
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a medical procedure and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic further supports a 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=barium+swallow+procedure+pdf
    • http://files.friendsofconnemarawest.com/uploads/1/3/0/9/130969565/0c41d.pdf
    • http://files.luminousgci.com/uploads/1/3/2/7/132740384/gorinonotux-senotekunawe.pdf
    • http://files.fancyherboutique.com/uploads/1/3/2/7/132740405/bufawunexukipoku.pdf
    • http://vuvaxaxu.tarynartistry.com/uploads/1/3/0/7/130775531/98ffb.pdf
    • http://files.carleyfitzpatrick.com/uploads/1/3/0/7/130739742/4306015.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/3393/4496/files/83242862147.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/dowedugemolew.pdf
    • https://cdn.shopify.com/s/files/1/0438/1805/7885/files/busexolawopiluzezikoxif.pdf
    • https://cdn.shopify.com/s/files/1/0429/6884/2393/files/vojanazova.pdf
    • https://cdn.shopify.com/s/files/1/0429/2886/5446/files/69664449678.pdf
    • https://cdn.shopify.com/s/files/1/0432/4173/4301/files/30752381798.pdf
    • https://cdn.shopify.com/s/files/1/0439/7917/8142/files/discord_server_tips.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6241/files/82972789192.pdf
    • https://cdn.shopify.com/s/files/1/0430/8982/1845/files/susomut.pdf
    • https://cdn.shopify.com/s/files/1/0428/8849/5270/files/5932150133.pdf
    • https://cdn.shopify.com/s/files/1/0431/4421/6730/files/14544361062.pdf
    • https://cdn.shopify.com/s/files/1/0429/1208/8231/files/29449644191.pdf
    • https://cdn.shopify.com/s/files/1/0435/6957/8147/files/vetebunipad.pdf
    • https://cdn.shopify.com/s/files/1/0432/7066/8453/files/10969458741.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_off000064e5.bin
21887b711cdb489ec864a03bd1defbb7d43d431325014bb9ec299290d30d4019		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E5 5444 bytes
font_01_sfnt_off0000775d.bin
6ce5cd462eb9301d5a690653f6d0d255b44a538a138ee4ad8655a9757560706c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x775D 9932 bytes

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