Malicious PDF — malware analysis report

Static analysis result for SHA-256 1755dba3d3aa4353…

MALICIOUS

PDF

428.6 KB Created: 2020-08-10 11:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7171e509bb235aecece4b99f9a3e8079 SHA-1: ed2758ae7e5511c154a2e12fa98566774679f371 SHA-256: 1755dba3d3aa4353d2150a97f0fc7e232b132b0b1392d614888363a27bd1a7a5
102 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a known malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged the PDF as malicious with a high confidence score. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to trick the user into downloading further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

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.
  • 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.ru/pify?keyword=pathfinder+playtest+bestiary+pdf
    • http://files.kollytrendz.com/uploads/1/3/1/6/131606262/84e6c73d7f8.pdf
    • http://files.ricrodriguezfiction.com/uploads/1/3/1/3/131380842/zufixewomigixo.pdf
    • http://files.hannahjudson.com/uploads/1/3/1/1/131163533/6559444.pdf
    • http://files.elementaryethnicstudies.com/uploads/1/3/1/4/131454317/6513144.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8640/4000/files/vuvufiwotirudunoneb.pdf
    • https://cdn.shopify.com/s/files/1/0440/0565/4678/files/fipogigebutanuvaxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1522/files/43430088825.pdf
    • https://cdn.shopify.com/s/files/1/0434/0675/3948/files/gabebosivivitemiju.pdf
    • https://cdn.shopify.com/s/files/1/0434/1750/1852/files/49316396794.pdf
    • https://cdn.shopify.com/s/files/1/0437/6946/2935/files/avg_activation_code.pdf
    • https://cdn.shopify.com/s/files/1/0430/2992/1943/files/16699993304.pdf
    • https://cdn.shopify.com/s/files/1/0430/9162/4096/files/73525376483.pdf
    • https://cdn.shopify.com/s/files/1/0436/5864/1573/files/resunelijero.pdf
    • https://cdn.shopify.com/s/files/1/0435/8871/4653/files/jack_lalanne_power_juicer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/6355/8815/files/endorser_addendum.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/kesosam.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5591/files/domadifumekom.pdf
    • https://cdn.shopify.com/s/files/1/0433/0792/5654/files/satane.pdf
    • https://cdn.shopify.com/s/files/1/0434/4319/1969/files/91900609418.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_off000662c4.bin
8efb96bf3fbcdc8bf3d5ebdee4c8ff10760b9630e9fe24f5ba454f3b126d8069		 pdf-font-stream PDF embedded font (sfnt) at offset 0x662C4 5372 bytes
font_01_sfnt_off00067505.bin
64a23859b7789a2889c50606caa64a63944dddffe87c7e809b864c49857b02b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67505 14312 bytes

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