Malicious PDF — malware analysis report

Static analysis result for SHA-256 03377846087d4428…

MALICIOUS

PDF

80.1 KB Created: 2020-09-08 17:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90734ae81d063e52e0ca74ac189bf914 SHA-1: 23507f482d1896b01769642fd6db230d10998a59 SHA-256: 03377846087d44288b0841ca23a6b96f560daf4e618248932fd8b0f801eae5c2
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wix?keyword=cholesterol+screening+guidelines+aafp
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/cfa91a_587746fc226d427da54a146df9a5bdd9.pdf
    • https://static.usrfiles.com/ugd/0ebc1f_7cacde7e602546d8a18de7d8deddea32.pdf
    • https://static.usrfiles.com/ugd/b8c837_113ebf78a3324752a355d55de411a222.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_3a3ecb1c877a4ee18b0683c7d8c5e0ef.pdf
    • https://static.usrfiles.com/ugd/5899d5_5c742ec837f74a9686b9e7c0ee0c8485.pdf
    • https://static.usrfiles.com/ugd/df7b34_2937610f9867472292046634db9b9316.pdf
    • https://static.usrfiles.com/ugd/b7ab08_348b73b497fd4178984f0d7fea28054e.pdf
    • https://static.usrfiles.com/ugd/cec570_cb74b368d92e49a29c151a2e908dd633.pdf
    • https://static.usrfiles.com/ugd/b8c837_bbd1b390e60e4e74af14b6be7255507b.pdf
    • https://static.usrfiles.com/ugd/739437_719f3703d2054aefb6f069fa7534b163.pdf
    • https://static.usrfiles.com/ugd/edb4a7_48fb468899b54ac38b322ab3d0b53ef8.pdf
    • https://cdn.shopify.com/s/files/1/0433/8404/5719/files/bidekurewoneniximowedago.pdf
    • https://cdn.shopify.com/s/files/1/0459/5456/4255/files/67627270860.pdf
    • https://cdn.shopify.com/s/files/1/0430/0577/1927/files/72762362722.pdf
    • https://cdn.shopify.com/s/files/1/0429/2280/3363/files/zoxojadutifaloti.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed23.bin
d6cc0fb66d47c2f18a4dda8ce3e677520f60fb717f16309f4fc8c75228af2db5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED23 5320 bytes
font_01_sfnt_off0000ff32.bin
a2434fd11e9a2e213dea03f52a03a839b861494472822430ee17241382d6aac6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF32 11144 bytes
font_02_sfnt_off0001251c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1251C 4324 bytes

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