Malicious PDF — malware analysis report

Static analysis result for SHA-256 8237297bc9d100d0…

MALICIOUS

PDF

36.9 KB Created: 2020-08-12 15:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60b029e0f483e403f86941fdbfe52485 SHA-1: 13c52e06892ff9a6ffde6fb79f3b71e7b5328d84 SHA-256: 8237297bc9d100d0538ebb2513401c116f332e9b938d44e1bd73715a14e153ce
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though partially corrupted, contains text suggesting a lure for free business administration PDFs, which is a common tactic for phishing or malware distribution. The presence of numerous PDF links, many pointing to Shopify domains, further supports the idea of a link farm designed to obscure the malicious redirector.

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.com/pify?keyword=administracion+de+peque%25C3%25B1as+empresas+servulo+anzola+pdf+gratis
    • http://xiwefilo.saeedcomputer.com/uploads/1/3/1/4/131453134/vefali_rizofa_vujupamalesowep.pdf
    • http://files.abigailbacon.com/uploads/1/3/0/8/130874518/e219fd.pdf
    • http://files.umbrellaproject.co.nz/uploads/1/3/0/9/130969573/kejotomazenagel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5282/5750/files/al_akhbar_egypt.pdf
    • https://cdn.shopify.com/s/files/1/0430/8389/0850/files/zoxasiwubugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8799/4792/files/25509588789.pdf
    • https://cdn.shopify.com/s/files/1/0435/7432/9507/files/dnd_saving_throw.pdf
    • https://cdn.shopify.com/s/files/1/0431/9097/6673/files/gufamarojomaweromegojetov.pdf
    • https://cdn.shopify.com/s/files/1/0433/9626/8193/files/93559765495.pdf
    • https://cdn.shopify.com/s/files/1/0429/0792/6687/files/celebration_hymnal_for_everyone_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/7383/1072/files/vividonasovimow.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/gowexonadipinivuzamizoki.pdf
    • https://cdn.shopify.com/s/files/1/0439/9484/1246/files/android_studio_installation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/3491/8558/files/1831951833.pdf
    • https://cdn.shopify.com/s/files/1/0432/6742/4416/files/ansiedad_social_en_nios.pdf
    • https://cdn.shopify.com/s/files/1/0429/6795/7658/files/xidedinumuvenob.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_off00004b6a.bin
e38f06256830756a666526304088f0fd1b1bce7c574f23b7d30edfa68a874b57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B6A 5912 bytes
font_01_sfnt_off00005f34.bin
1058aeb2f64517b8a5952b3bb929156b044644d0c29e48511265f34055184fde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F34 11060 bytes

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