Malicious PDF — malware analysis report

Static analysis result for SHA-256 12645e2f24f716f3…

MALICIOUS

PDF

44.7 KB Created: 2020-08-22 02:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8aee16958895b38d62c786de7207d303 SHA-1: ebb27a5677fdafdfa35030db4a023d1b5b380aee SHA-256: 12645e2f24f716f3dc8661fbb3aaf32917989cea40243c21830f76c45ed27eb6
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. It also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, some of which are benign but others are unknown. The ML classifier strongly flagged this PDF as malicious, and the presence of urgency language further supports a phishing or scam attempt. The primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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/pify?keyword=business+ideas+in+kenya+pdf
    • http://repetedu.homeschoolbrew.com/uploads/1/3/0/8/130874030/3910324.pdf
    • http://files.gfox-insurance-agency.com/uploads/1/3/2/8/132815206/gojuwewajogenev_domuke_toveg_tipunen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/0690/2950/files/advantages_of_solar_energy.pdf
    • https://cdn.shopify.com/s/files/1/0432/0401/8336/files/caia_level_1_practice_exam.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8184/files/18239491040.pdf
    • https://cdn.shopify.com/s/files/1/0436/0319/8116/files/diagnostico_operativo_empresarial.pdf
    • https://cdn.shopify.com/s/files/1/0428/3577/1558/files/arthritis_back_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/xiwases.pdf
    • https://cdn.shopify.com/s/files/1/0428/3046/3142/files/80986596782.pdf
    • https://cdn.shopify.com/s/files/1/0439/3422/0456/files/tanevapa.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/astral_upvc_pipe_fittings_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0429/7608/4117/files/59238386637.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_off000071a1.bin
8b0d987618bee3f963fe43ef481a9d5c4817530dc6c9057a13d072d4efdf02e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71A1 5120 bytes
font_01_sfnt_off00008331.bin
350ba78924f3e2563dcdd03c8c0ff005cc7bb54bb3e3925c5e07d31801f7790c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8331 10260 bytes

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