Malicious PDF — malware analysis report

Static analysis result for SHA-256 655b1cd9c18a9467…

MALICIOUS

PDF

43.9 KB Created: 2020-08-22 03:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b46c0c1b52e9df13adc3974b5ea5e1e7 SHA-1: d695c98a164ad58067bf2280ffe0faac1272f865 SHA-256: 655b1cd9c18a9467ab1597e2cf04211af2eb08f05708f308793207f0462431f5
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure for a 'bible app for windows 7 free', which is likely a pretext to encourage clicks on the malicious links. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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.cc/pify?keyword=bible+app+for+windows+7+free
    • http://wetivevu.hodgmanrecipes.com/uploads/1/3/1/3/131378850/zofajevobex_lawodovozoxemu_taduviku_zutoxe.pdf
    • http://files.clarkstonphysio.com/uploads/1/3/2/6/132696104/dawedurorusis.pdf
    • http://files.pubpronetworkconference.com/uploads/1/3/2/6/132682235/2955a0a.pdf
    • http://files.splitteralpine.com/uploads/1/3/1/6/131607163/tewagefifus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0151/1064/files/terex_760b_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/8907/6117/files/tufugukisukuvogixabet.pdf
    • https://cdn.shopify.com/s/files/1/0432/5461/2123/files/72526431230.pdf
    • https://cdn.shopify.com/s/files/1/0439/3048/4904/files/.pdf
    • https://cdn.shopify.com/s/files/1/0434/8860/8418/files/33431174747.pdf
    • https://cdn.shopify.com/s/files/1/0435/5801/1035/files/87388336035.pdf
    • https://cdn.shopify.com/s/files/1/0429/7919/7081/files/gameloft_android_games_cracked_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/1219/4463/files/49050747093.pdf
    • https://cdn.shopify.com/s/files/1/0433/9384/3356/files/starpoint_gemini_warlords_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/28180519904.pdf
    • https://cdn.shopify.com/s/files/1/0428/5884/0223/files/wegetopedopogarorelutit.pdf
    • https://cdn.shopify.com/s/files/1/0428/1755/2543/files/49096747698.pdf
    • https://cdn.shopify.com/s/files/1/0433/5216/2462/files/access_consciousness_bars_points.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_off00006cd9.bin
5b5783d1f0d5de9e3f627b89a94ffec28fb9c1322d4560add138c11e7b626222		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD9 5396 bytes
font_01_sfnt_off00007f50.bin
62b7a83e6b9b8a2722e8d50377fb3b52dbbf0a4a6917c8bc3e7356dde586968a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F50 10364 bytes

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