Malicious PDF — malware analysis report

Static analysis result for SHA-256 7235170df92ba5bf…

MALICIOUS

PDF

49.1 KB Created: 2020-08-15 09:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f690ee117081cd04722b201cbe350ab SHA-1: 4c4333a8db92990cdcbe97dbaf4f082e3fb722ff SHA-256: 7235170df92ba5bf1319ac880b7d2bacdd11c5488dbfd0b8af2ccff4621f1d70
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.cc). This suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly indicated maliciousness. Although no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings point towards a phishing or redirection attack.

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.cc/wb?keyword=summa%20contra%20gentiles%20deutsch%20pdf
    • http://jeleku.margek.com/uploads/1/3/1/4/131453284/nomuderofixumomafidi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9517/8902/files/obx_surf_report.pdf
    • https://cdn.shopify.com/s/files/1/0428/1987/9068/files/mufaxenufomelapevi.pdf
    • https://cdn.shopify.com/s/files/1/0435/7485/3793/files/taurus_millennium_45.pdf
    • https://cdn.shopify.com/s/files/1/0433/6159/9656/files/ginadazexam.pdf
    • https://cdn.shopify.com/s/files/1/0434/5036/8152/files/45735167834.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/clinical_examination_of_farm_animals.pdf
    • https://cdn.shopify.com/s/files/1/0431/7691/9200/files/applied_psychology_in_human_resource_management_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0446/2706/7043/files/learn_french_for_beginners_through_english.pdf
    • https://cdn.shopify.com/s/files/1/0428/7404/4579/files/certificate_of_appreciation_for_students.pdf
    • https://cdn.shopify.com/s/files/1/0436/9825/8088/files/akron_rubber_ducks_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0430/5040/1943/files/bhagavatam_telugu_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/0475/5096/files/ponurorakodasejarimafex.pdf
    • https://cdn.shopify.com/s/files/1/0428/5700/5215/files/91762942006.pdf
    • https://cdn.shopify.com/s/files/1/0432/2669/3789/files/rebomopefoned.pdf
    • https://cdn.shopify.com/s/files/1/0427/8750/4294/files/dawuferu.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_off00007e2c.bin
781ec15aaf4b07784e8f21aef37e93a5bd57973fd8c371f3c5405c19a79dd01f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E2C 5672 bytes
font_01_sfnt_off0000913c.bin
daa9f6d29d23bd9ac7c8ba3267d29f186119f22894430f8755dff165765a2bb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x913C 11336 bytes

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