Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9bf3b9b763d6bc…

MALICIOUS

PDF

36.5 KB Created: 2020-08-16 23:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24e92e250a9d73bec08901f2419d0eac SHA-1: 2f01181230c55043158897951ce462f0f56c11d5 SHA-256: ca9bf3b9b763d6bcbbb1431c9b5cd69ae82c01f7e1b181406a830ef490fa98f3
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=english+tagalog+translator+free++apk', is designed to redirect users to malicious infrastructure. The document body itself contains garbled text but includes the malicious URL, suggesting a lure to trick users into clicking it. No scripts were extracted, but the presence of the malicious link and the ML classifier's high confidence indicate a malicious intent to redirect the user.

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=english+tagalog+translator+free++apk
    • http://files.nancypaulinephotography.com/uploads/1/3/1/3/131398555/87cffe55712a.pdf
    • http://fuwevibog.jenibe.com/uploads/1/3/0/7/130738730/zijolinezesan-rimizob-wisigexepetepi-pafeposorez.pdf
    • http://files.morganelwell.net/uploads/1/3/0/9/130969740/1467358.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54313135065.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8550/files/dokigavafalig.pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3701/files/zikafogutiverikoposi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3705/5393/files/equus_africanus_asinus.pdf
    • https://cdn.shopify.com/s/files/1/0431/0191/3244/files/86349560718.pdf
    • https://cdn.shopify.com/s/files/1/0434/7713/9613/files/beast_quest_mod_apk_obb.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5137558887.pdf
    • https://cdn.shopify.com/s/files/1/0431/8570/1025/files/rozevovulerek.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/tanijodizev.pdf
    • https://cdn.shopify.com/s/files/1/0428/7247/1715/files/76313428417.pdf
    • https://cdn.shopify.com/s/files/1/0437/8837/0072/files/statistics_4th_edition_freedman_pisani_purves.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1038/files/analogias_verbales_definicion.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_off000051b4.bin
cf7007240883b709ddf0a18fc0087c98aec4e4353dd1df529ea84ba807c1f928		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51B4 5184 bytes
font_01_sfnt_off00006354.bin
46cca62a9b9f2566bd1289d76d80681fc99012ef6613864bbcbe552ce482d001		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6354 9856 bytes

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