Malicious PDF — malware analysis report

Static analysis result for SHA-256 6549c2ef25a8cdc1…

MALICIOUS

PDF

45.4 KB Created: 2020-08-20 05:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af7d054d1dfec831fb0f086c8004491f SHA-1: 1cdd8ae87fcd5bb837c7fee4ae117d83c64c3f87 SHA-256: 6549c2ef25a8cdc11c92586482f4465dbdbe1b4a5aa57aa544935f947c69c254
162 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be a lure for financial templates, further supported by the 'SE_DOWNLOAD_BUTTON' heuristic. The ML classifier also strongly indicated maliciousness.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=financial+modeling+templates
    • http://files.chrisdawphotography.co.uk/uploads/1/3/1/6/131637402/5021266.pdf
    • http://mowof.michelleaoates.com/uploads/1/3/0/9/130969648/vozakigibinurono.pdf
    • http://files.climateweekaberdeen.org/uploads/1/3/1/3/131379832/jopojuzazigane-visis-sifukug.pdf
    • http://files.amsbandandchoir.com/uploads/1/3/2/6/132682758/e8d8ddb04e1.pdf
    • http://files.poriruachurch.com/uploads/1/3/0/7/130776487/kosotidebovejonimeg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3500/7893/files/rikogolubazaxive.pdf
    • https://cdn.shopify.com/s/files/1/0432/6385/2712/files/mijeginogabuxidoza.pdf
    • https://cdn.shopify.com/s/files/1/0429/3489/4755/files/kitefefururomizekanawa.pdf
    • https://cdn.shopify.com/s/files/1/0435/0928/5024/files/android_update_version_7._0.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15906675896.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/allah_allah_tarif_teri_video_gana.pdf
    • https://cdn.shopify.com/s/files/1/0436/4143/8366/files/angular_momentum_in_quantum_mechanics_a._r._edmonds.pdf
    • https://cdn.shopify.com/s/files/1/0452/6263/5168/files/entrepreneurship_course_notes.pdf
    • https://cdn.shopify.com/s/files/1/0448/0948/6498/files/2017_subaru_outback_owner_s_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/nakonajik.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3545/files/vurededitakodeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/63528209012.pdf
    • https://cdn.shopify.com/s/files/1/0430/3699/9842/files/17585604472.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_off000072bd.bin
a5b3b727220ad7ec2b838cfbc52d7caf0e6bc6c89de1df1a17eb6cdb88451daa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72BD 5252 bytes
font_01_sfnt_off00008484.bin
9d71c6b57cb96c211f69559aca9a42ce35679099c9a04d44f5d37721d9786da6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8484 10588 bytes

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