Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a04fde646ddfa8…

MALICIOUS

PDF

102.6 KB Created: 2020-07-31 06:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93a5bdb60c4b8e0ffac82968ee5df182 SHA-1: 206b690e1aeeee054e1c4b423b27f4c670e489cb SHA-256: 10a04fde646ddfa894ff3be43577c63da70e743c5078ad8891feef6272329cd6
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to what appears to be a link farm designed to host malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=antibodies+structure+and+function+pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, suggests a lure related to PDF downloads.

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=antibodies+structure+and+function+pdf
    • http://files.makeastatementjewelry.com/uploads/1/3/1/3/131398281/7627175.pdf
    • http://files.nowwhat-services.com/uploads/1/3/0/7/130739251/8898280.pdf
    • http://files.verticalmilerally.com/uploads/1/3/1/4/131438397/3163382.pdf
    • http://files.tigerseyejournal.com/uploads/1/3/2/6/132681670/69828.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7421/4306/files/84764095321.pdf
    • https://cdn.shopify.com/s/files/1/0436/4143/8366/files/2569337279.pdf
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/wujagajorisonujupox.pdf
    • https://cdn.shopify.com/s/files/1/0432/8764/2267/files/papalewil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/danedogorolulefumatexa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0279/7986/files/matofifabudetitifili.pdf
    • https://cdn.shopify.com/s/files/1/0435/3451/6376/files/sajowek.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43396058945.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0401/files/64763595446.pdf
    • https://cdn.shopify.com/s/files/1/0431/4326/6458/files/47699334925.pdf
    • https://cdn.shopify.com/s/files/1/0431/7446/1589/files/pogumixuparilowowale.pdf
    • https://cdn.shopify.com/s/files/1/0433/2155/7150/files/rojovob.pdf
    • https://cdn.shopify.com/s/files/1/0433/6985/7176/files/kubujapapekawatat.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_off000155f2.bin
a1845c46d7073cd1ff18b99d792c2285067946c3aba56b60f5bd3ed35068c019		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155F2 5128 bytes
font_01_sfnt_off00016761.bin
0ba454230089268054fc8895968fa55ed785765f4461e67a4b28dea7fe124057		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16761 10920 bytes

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