Malicious PDF — malware analysis report

Static analysis result for SHA-256 658ca3747c2ed1a2…

MALICIOUS

PDF

69.9 KB Created: 2020-07-31 20:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee937f6e9cf8e69add376193f366054b SHA-1: 2efad3adbd774ecea567c4253e99a537b09ec087 SHA-256: 658ca3747c2ed1a2c6312bace8023029ffbbb9171792014613eff2651b94ab64
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to the embedded links, suggesting a lure. The presence of numerous external links points towards a link farm or SEO manipulation tactic, potentially to distribute malware or phish users.

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.cc/pify?keyword=the+lonely+island+songs
    • http://files.westfieldboyssoccer.com/uploads/1/3/2/7/132740445/b01b3cde64.pdf
    • http://files.mascarachronicles.ca/uploads/1/3/1/3/131382113/8364707.pdf
    • http://files.horseshoecrabtagging.org/uploads/1/3/2/6/132681545/wutazowasopor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/0499/2408/files/3569738443.pdf
    • https://cdn.shopify.com/s/files/1/0431/7803/3313/files/54660316786.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/57766425672.pdf
    • https://cdn.shopify.com/s/files/1/0439/5083/3822/files/4701966883.pdf
    • https://cdn.shopify.com/s/files/1/0435/8314/4104/files/33553581423.pdf
    • https://cdn.shopify.com/s/files/1/0432/8819/9332/files/sovukaruradawi.pdf
    • https://cdn.shopify.com/s/files/1/0430/1383/2857/files/rulirowesed.pdf
    • https://cdn.shopify.com/s/files/1/0431/0407/5933/files/lenofoge.pdf
    • https://cdn.shopify.com/s/files/1/0433/5032/7451/files/kifenaporagitogi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8153/0534/files/82362631283.pdf
    • https://cdn.shopify.com/s/files/1/0427/6686/0455/files/37948031350.pdf
    • https://cdn.shopify.com/s/files/1/0428/6329/6678/files/51999307067.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xoxolesusoziviro.pdf
    • https://cdn.shopify.com/s/files/1/0428/1873/2191/files/sepor.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mupuxisupevijerabufogete.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_off0000c96b.bin
10e7b643bea350932538e06a5dcb8f5618695d4d5c69f441ef485dfec6aa87d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC96B 5040 bytes
font_01_sfnt_off0000da99.bin
dc24b2e8ef34b317eaa86f4035e9d28f4c50ede8a315dcf85b75cf169337625f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA99 15364 bytes

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