Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b19a0324a8bd87…

MALICIOUS

PDF

32.8 KB Created: 2020-09-02 18:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74112ca4ea1d8ab42f1fec75b4fb36cf SHA-1: 5ff102c969ce7ba52d9815514af39d895f06ada5 SHA-256: 65b19a0324a8bd87e99196fa5711705b5c216ca35623ce76b0fa073555327a96
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links directs to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL and title as the malicious redirector, suggesting a lure to trick users into clicking the malicious link.

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.club/pify?keyword=double+meaning+question+and+answer+in+nepali
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6676/9051/files/rolipevor.pdf
    • https://cdn.shopify.com/s/files/1/0435/3127/2351/files/continuing_professional_development_record_template.pdf
    • https://cdn.shopify.com/s/files/1/0429/0091/4343/files/62188925169.pdf
    • https://cdn.shopify.com/s/files/1/0434/6766/9654/files/zikaxopolut.pdf
    • https://cdn.shopify.com/s/files/1/0431/7557/5709/files/53124245923.pdf
    • https://cdn.shopify.com/s/files/1/0431/7596/8928/files/4227138087.pdf
    • https://cdn.shopify.com/s/files/1/0429/0845/0972/files/8760673004.pdf
    • https://cdn.shopify.com/s/files/1/0431/4644/4960/files/vte_risk_assessment_form.pdf
    • https://static.usrfiles.com/ugd/a01749_944085922d1d404db3e261210041f0cf.pdf
    • https://static.usrfiles.com/ugd/b7ed05_eaadb424b5ed4a0982e38e0d005fdfe3.pdf
    • https://static.usrfiles.com/ugd/03dcd4_e04432de650c4817b83ac7804ac91253.pdf
    • https://cdn.shopify.com/s/files/1/0461/7836/9699/files/masudatasad.pdf
    • https://cdn.shopify.com/s/files/1/0433/0727/0297/files/bayesian_game_theory.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_off00004239.bin
ae266d1e85f3363a998d6ec0e331c1a1466493ff69f9c3382f377d28ba29ed21
pdf-font-stream PDF embedded font (sfnt) at offset 0x4239 5636 bytes
font_01_sfnt_off00005549.bin
72c60f4db757899a4775d0e0bb5488b7f00295749d10fa02d98f1af81b1697b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5549 9672 bytes