Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bf1e87237e7b0d…

MALICIOUS

PDF

36.4 KB Created: 2020-07-27 17:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36d1b9350910c7683001b614cc353005 SHA-1: 80983cd2b3916d5b57f6ad88ad498706c02c1c3e SHA-256: 73bf1e87237e7b0d8c6aa18ecf2fdf31e56d8b7ef753fe143fe6a89d24c5705b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to known malicious infrastructure. Additionally, PDF_SEO_LINK_FARM indicates a mass of external PDF links, with one pointing to a Shopify domain. The ML classifier also strongly flagged this PDF as malicious. These factors suggest the document is designed to lure users to malicious sites, likely as part of a phishing or scam campaign.

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=alter+ego+plus+4
    • http://files.bodilife.net/uploads/1/3/1/8/131871852/2c5a4.pdf
    • http://files.selectricartists.com/uploads/1/3/1/4/131407655/2763129.pdf
    • http://files.norcalpomeranians.com/uploads/1/3/1/4/131437702/f8e984a7d.pdf
    • http://files.fmta.org/uploads/1/3/0/7/130739449/jetupudopelojiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/logebuvi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7822/1973/files/xepegunafotasexulepep.pdf
    • https://cdn.shopify.com/s/files/1/0430/9961/9492/files/72011971917.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/57236722905.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8106/files/tokizu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2384/2983/files/30996503159.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/26735543656.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7742/files/61576944823.pdf
    • https://cdn.shopify.com/s/files/1/0431/1724/8672/files/zatokugaxezowaveruv.pdf
    • https://cdn.shopify.com/s/files/1/0437/2260/4695/files/soxatibakurijufinod.pdf
    • https://cdn.shopify.com/s/files/1/0435/8026/0511/files/nidaxin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1741554469.pdf
    • https://cdn.shopify.com/s/files/1/0440/1584/5541/files/gifubulagikomapanirotida.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_off000053bf.bin
74d83e2db11f69e503e9503b3ee4f4f1a8b9588e2d6887241884bf2afb29287c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53BF 4580 bytes
font_01_sfnt_off00006377.bin
e910ab1dfd28df9e6780b180e3fdab549521aff5727fe175259dbaabf832318e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6377 9768 bytes

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