Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1c6639ab59841e…

MALICIOUS

PDF

48.5 KB Created: 2020-08-09 01:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5f6a6fa8228258fadaa2e1dd07b24f6 SHA-1: 0084eaed8f0a05cbf4fe94903b105813dcb5c802 SHA-256: 8a1c6639ab59841e4fe658169cc7dfd94cad6a0555742cd484c7c6930f3b9b19
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=mla+citation+pdf+purdue+owl'. Another critical heuristic identified a PDF link farm hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL and other URLs pointing to potentially malicious content, indicating a lure to external malicious sites.

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=mla+citation+pdf+purdue+owl
    • http://kupej.shsase.com/uploads/1/3/2/6/132681488/gigeso.pdf
    • http://files.westmountwildrugby.com/uploads/1/3/1/4/131407263/wobama.pdf
    • http://files.jayskaufman.com/uploads/1/3/1/4/131453329/zaviwijenuvoju.pdf
    • https://cdn.shopify.com/s/files/1/0431/4939/4080/files/wiwetokekilogasofogoboxu.pdf
    • https://cdn.shopify.com/s/files/1/0440/0644/1110/files/27196798142.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6690/files/89054136965.pdf
    • https://cdn.shopify.com/s/files/1/0434/3998/0710/files/download_cengage_organic_chemistry_for_jee_advanced_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/8106/4853/files/carburizing_heat_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0432/0054/4931/files/sopuloxotukarej.pdf
    • https://cdn.shopify.com/s/files/1/0437/6910/2485/files/berlitz_english_level_1.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0995/files/ganesha_atharvashirsha_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0437/8918/9272/files/rivofotitolefunek.pdf
    • https://cdn.shopify.com/s/files/1/0428/9386/9223/files/migixuruxavusikenup.pdf
    • https://cdn.shopify.com/s/files/1/0430/6839/1591/files/wawakun.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007153.bin
827d2a49b8a89adedcb193f23785bccd13a6e1bcf099391ad777d0be099ffb96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7153 4948 bytes
font_01_sfnt_off00008241.bin
0ba747763db3c65d1fce7125518c29c034663a4fe55a8e659d0f8dab5813de7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8241 10812 bytes
font_02_sfnt_off0000a6ee.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6EE 4324 bytes

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