Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3ab5aecc279b26…

MALICIOUS

PDF

71.5 KB Created: 2020-07-23 14:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1298a8c3d0271f6ff2693a62c4dbc06 SHA-1: 23fe9832073e61e421aa0981822634da776a39e8 SHA-256: 5c3ab5aecc279b26c1f06b363665004d82927812afe2274f1a1ea02bdeda5613
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits a large number of external PDF links, suggesting a link farm or redirection strategy. The presence of a 'Download Button' heuristic further supports a lure-based attack pattern. No scripts were extracted, but the malicious link is the primary indicator of compromise.

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.com/pify?keyword=adb+force+install+apk
    • http://files.tarrytownconnected.com/uploads/1/3/0/7/130739309/1197665.pdf
    • http://files.thetreesspeak.org/uploads/1/3/1/8/131856039/62856.pdf
    • http://files.en.homecade.com/uploads/1/3/0/7/130739483/fifajajuzavef-gurixiva-razoli.pdf
    • http://files.antoinettecarrier.com/uploads/1/3/1/1/131164027/mazemogenifajilog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3174/6967/files/betojezamazawadufiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/4468/4454/files/61700646551.pdf
    • https://cdn.shopify.com/s/files/1/0429/6320/6307/files/gekuwesupudetoxuma.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9397/files/23203861778.pdf
    • https://cdn.shopify.com/s/files/1/0432/4704/2715/files/nazozak.pdf
    • https://cdn.shopify.com/s/files/1/0431/7220/0608/files/14910945701.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tozonolemudafolafoxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7570/6788/files/zixulokuliv.pdf
    • https://cdn.shopify.com/s/files/1/0435/5211/2804/files/pareromiseguwofojoxomodu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7957/files/54455400809.pdf
    • https://cdn.shopify.com/s/files/1/0430/4538/8442/files/kuzoxefuxi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7266/files/59574437893.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_off0000d35d.bin
2ee636d4a8d49ac8ff9d59d5ef6530db72dd59688ab0ebde102250a50ebaa343		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD35D 5132 bytes
font_01_sfnt_off0000e4d0.bin
abc8fab96ec32ec0cd0a0b6a9a53456a5e7141691b2166bafa88293038ee32fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D0 13596 bytes

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