Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef399529b7c04b5…

MALICIOUS

PDF

44.1 KB Created: 2020-08-07 05:39:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb37c72d54394358c34a8d93a53fdc71 SHA-1: fdb267b09ade3d003ca3d78a636bf0a4efbc8e90 SHA-256: 0ef399529b7c04b586f2547ca94c209eacef46d08e0c6566709d645673521cf3
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 external PDF files, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://ttraff.ru/pify?keyword=history+of+ethnic+conflict+in+nigeria+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other PDF links, reinforcing the lure. The ML classifier strongly flagged this PDF as malicious.

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.ru/pify?keyword=history+of+ethnic+conflict+in+nigeria+pdf
    • http://files.feedmeup.net/uploads/1/3/1/3/131379060/1490528.pdf
    • http://files.adventurecon.co.uk/uploads/1/3/1/4/131452800/4fbc71202df0543.pdf
    • http://files.steveellisworld.com/uploads/1/3/1/4/131454012/30f3cb9.pdf
    • http://files.here2helpnj.org/uploads/1/3/0/7/130739987/7046033.pdf
    • http://files.happytailsdaycare.com/uploads/1/3/0/7/130740092/bopezezozun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1955/8299/files/wwdc_2016_videos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50751207741.pdf
    • https://cdn.shopify.com/s/files/1/0435/0076/5336/files/bonuvu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1896/0545/files/conductas_antisociales_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0435/3340/2266/files/rolurulabuloriroxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/8189/9936/files/apprendre_anglais_gratuit_debutant.pdf
    • https://cdn.shopify.com/s/files/1/0431/5519/4011/files/fetexajewarovoneku.pdf
    • https://cdn.shopify.com/s/files/1/0429/5386/7427/files/gadenoxumeterejerojefabe.pdf
    • https://cdn.shopify.com/s/files/1/0438/6743/9259/files/neuralgia_de_arnold_fisioterapia.pdf
    • https://cdn.shopify.com/s/files/1/0435/4228/2399/files/4901643539.pdf
    • https://cdn.shopify.com/s/files/1/0440/8908/2006/files/bbc_english_class_12_literary_companion.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_off00006580.bin
bf63d85af84e6ed2c012abf58597ce927bb501ec88d5fa9f744f74ad2940b5f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6580 5480 bytes
font_01_sfnt_off00007827.bin
4f7864228955473027f505a997a617666c1fbb065b5338f55aebe05c76344519		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7827 12992 bytes

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