Malicious PDF — malware analysis report

Static analysis result for SHA-256 765da923ea48b6bb…

MALICIOUS

PDF

32.3 KB Created: 2020-08-21 09:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e114d86a26a722822bc883073540e9d SHA-1: bc4c9b9040f437b853d850df9f6e07c19ab72715 SHA-256: 765da923ea48b6bba1c391ad2ce6671b236c4e54229739c3c7e72a9589c340fa
174 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that leads to a link farm of other PDFs, likely as part of a SEO poisoning or spam campaign. The document body and embedded links suggest a lure to trick users into clicking through to potentially malicious content. The ML classifier strongly flagged this PDF as malicious.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.com/pify?keyword=crossword+answer+for+midday+repast
    • http://files.skyhighvault.com/uploads/1/3/2/6/132682966/noterono-bikok-lexagulazav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9826/8065/files/zidedomakutularowixu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/75370111210.pdf
    • https://cdn.shopify.com/s/files/1/0431/0935/1585/files/light_novel_arifureta_bahasa_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0451/2360/0538/files/vastu_shastra_movie_720p.pdf
    • https://cdn.shopify.com/s/files/1/0431/0489/5143/files/nirefesoxepug.pdf
    • https://cdn.shopify.com/s/files/1/0430/1104/7575/files/ftb_academy_mod_list.pdf
    • https://cdn.shopify.com/s/files/1/0435/9972/4702/files/tewagesudakir.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5906/files/parenti_blackshirts_and_reds.pdf
    • https://cdn.shopify.com/s/files/1/0433/7342/8888/files/mixededezanugawufi.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_off000040d4.bin
11652716384bcb3f3a354732c175cd189d24904594e60a4970137f24e513fc42
pdf-font-stream PDF embedded font (sfnt) at offset 0x40D4 5256 bytes
font_01_sfnt_off000052b4.bin
ec066cc6a386ae2678a6aa9ba224117bbb09d23a675c77c28bd707eabc15e098
pdf-font-stream PDF embedded font (sfnt) at offset 0x52B4 10072 bytes