Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9b73ca025eaf37…

MALICIOUS

PDF

44.5 KB Created: 2020-09-03 17:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 13a8cdceec4d1156c27418766ef581ef SHA-1: a3d5593f2e5b8b06383a34a9db52d7f2edbd38bc SHA-256: 5d9b73ca025eaf375facaac3b80b4600e7efff4632b9ed8811dfe7dbd3386457
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to Shopify domains hosting other PDF files, suggesting a link farm or SEO abuse tactic. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=noncommissioned+officer+evaluation+reporting+system'. The document body, though heavily obfuscated, contains this URL and a reference to a 'noncommissioned officer evaluation reporting system', likely a lure. The ML classifier also strongly indicated maliciousness.

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=noncommissioned+officer+evaluation+reporting+system In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9991/2344/files/tejejizorirodisowimumuve.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0276/4184/files/47524398144.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5622/5688/files/vogexoxoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1319/3373/files/geometric_and_engineering_drawing_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5011/4978/files/swf_to_converter.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/027f51_d5216fb28b3846c386a72edb0a807097.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3be3a7_c3b2a56e4b4b448ba02fa5063a58b56f.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8624/2209/files/mogaxapifes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/8162/1664/files/99497002530.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64541570927.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9030/3393/files/kikakelekalego.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/de3d83_bdd325f0868349faaff21070ea8a2d40.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/906e9f_d5a86e2ab6aa4a7a8a2ee60be484cbcb.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9c58c5_0183393add9447068c888995913968d8.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FAB 5608 bytes
SHA-256: abd792b872b8a5ee0bd34f9d4f45af73df45959624a9dd905e509280d4652226
font_01_sfnt_off000082bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82BC 9964 bytes
SHA-256: 66f996caada3be4de5c6dcee9acf1856325f681985f6cc89b656574606d9b7a4

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