Malicious PDF — malware analysis report

Static analysis result for SHA-256 2adc72db0391a876…

MALICIOUS

PDF

46.9 KB Created: 2020-09-10 12:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fda29633f03fad89eb6e0720f98f5bb9 SHA-1: 5f0858b7cd22f033ad6beec44add4ad44c4762cc SHA-256: 2adc72db0391a876bb6e82690943cc5e2c205122d86aed715732e4d5b4c2e8d2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with many links pointing to SEO-optimized PDF lures. One prominent link, 'https://ttraff.me/wix?keyword=basic+programming+language+book+pdf', redirects to a known malicious domain. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains embedded URLs that are part of this link farm.

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.me/wix?keyword=basic+programming+language+book+pdf
    • http://silomer.coxlabuva.org/uploads/1/3/1/1/131164132/4477306.pdf
    • http://files.ethansteelelaw.com/uploads/1/3/1/4/131454065/muvewiremewo-sokago-kebeloduw-buwegawo.pdf
    • http://files.tritixregional.com/uploads/1/3/1/3/131381919/jeluxo.pdf
    • http://files.heavenlysly.com/uploads/1/3/2/6/132681824/fugomagotoso-supato-xavasajuzifoki.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/dexos.pdf
    • https://cdn.shopify.com/s/files/1/0450/2791/7974/files/3061853807.pdf
    • https://cdn.shopify.com/s/files/1/0438/0341/0589/files/concepto_de_arquitectura_sostenible.pdf
    • https://cdn.shopify.com/s/files/1/0435/7190/4673/files/40189023751.pdf
    • https://cdn.shopify.com/s/files/1/0430/3349/3655/files/dental_instruments_a_pocket_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/61022138671.pdf
    • https://cdn.shopify.com/s/files/1/0432/6581/8789/files/gifekiditaxojidimagobexat.pdf
    • https://cdn.shopify.com/s/files/1/0434/4555/1256/files/ideal_and_practical_voltage_and_current_sources.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xodowowesibaxen.pdf
    • https://cdn.shopify.com/s/files/1/0450/8319/7603/files/pugirekuluxiribegime.pdf
    • https://cdn.shopify.com/s/files/1/0433/9892/2392/files/rivijoforemujevugup.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007815.bin
159c3d073abaec90efcad625ec11d0c1fb43bc0dc7f3e12eea8e02a9c50c7aaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x7815 5728 bytes
font_01_sfnt_off00008b7e.bin
d4f2cea130364cb6321e0299a684ec87c19e55090adefe6bbcc7afd8a64be9f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B7E 10192 bytes