Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8f3619ee3b66bb…

MALICIOUS

PDF

46.6 KB Created: 2020-08-02 22:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d70500e931a235d0bbbfa2bb8efa6d0b SHA-1: 88bef9ce13d097969a311a26ea4896cc0d4e5cbf SHA-256: 8d8f3619ee3b66bb1cf325479b2bd875108223c40f7bfe4e1d4ad0f5f58a49a7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=the+substitute%253A+failure+is+not+an+option'. This indicates the document's primary purpose is to lure the user to a malicious site. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to obscure the malicious redirector. No scripts were extracted, but the embedded URL itself is sufficient evidence of malicious intent.

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+substitute%253A+failure+is+not+an+option
    • http://files.fujihoffmann.com/uploads/1/3/1/4/131454984/6750166.pdf
    • http://files.earnbetterfitness.co/uploads/1/3/2/7/132740413/vekifawixuza-kisugalolulol-zoxemibufobu.pdf
    • http://files.logansyndrome.com/uploads/1/3/0/8/130814238/sezamumugofat.pdf
    • http://files.agateinspections.com/uploads/1/3/2/6/132695575/cf6d7877c88.pdf
    • http://files.friedrichsfamilyadventures.com/uploads/1/3/1/4/131453990/pixanotagipapogo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3880/8991/files/48738806562.pdf
    • https://cdn.shopify.com/s/files/1/0434/7333/8533/files/71813283181.pdf
    • https://cdn.shopify.com/s/files/1/0431/2789/8268/files/10288954007.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0133/files/xagozuwixevolonafizupo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3926/8774/files/57947965517.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93861148098.pdf
    • https://cdn.shopify.com/s/files/1/0439/7400/0798/files/milesemiradozojif.pdf
    • https://cdn.shopify.com/s/files/1/0431/6217/3604/files/5467123974.pdf
    • https://cdn.shopify.com/s/files/1/0434/5534/8888/files/wuwuwotajuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3645/files/61685115288.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3387/files/69115634039.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/42588196523.pdf
    • https://cdn.shopify.com/s/files/1/0434/7900/7398/files/69263879357.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5193/files/yin_yang_turtle.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063c0.bin
ae46d6f9971d603ac2ee5c926a63ed3405d13dcb08ae672095cb81cb2f4cc1ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C0 5012 bytes
font_01_sfnt_off000074b5.bin
1f39cbeb7f4054764bc42af6031ea71d32e5df750404184013a8351602a73fc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B5 12568 bytes
font_02_sfnt_off00009f0e.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F0E 4324 bytes

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