Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0c9b8aaed93215…

MALICIOUS

PDF

48.8 KB Created: 2020-08-17 02:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bc8cb3fa9355abe69d216c4ac78cb02 SHA-1: 86ab668c0f01380ab7f95b04c64e5e4a698a059d SHA-256: 5c0c9b8aaed932151b361ba64ea4edca99512e9db19e89de92e42aa31a9b9cbf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF file contains a significant number of embedded URLs, many of which point to external PDF files hosted on various domains. One URL, 'https://ttraff.com/pify?keyword=down+arrow+icon', is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute further malicious content.

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=down+arrow+icon
    • http://files.support.famhealth.com/uploads/1/3/1/4/131437740/3357936.pdf
    • http://files.creturns.com/uploads/1/3/1/4/131409597/6987350.pdf
    • http://gajolax.kingfencetx.com/uploads/1/3/0/7/130776483/busukazakid-wapiz.pdf
    • http://xatogo.ygkcombativesgroup.com/uploads/1/3/0/8/130874631/madamezekomulax.pdf
    • http://files.whynotbeyourowndesigner.com/uploads/1/3/1/0/131070722/9411949.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2935/6959/files/all_dnd_races.pdf
    • https://cdn.shopify.com/s/files/1/0430/6714/6397/files/57466491463.pdf
    • https://cdn.shopify.com/s/files/1/0432/5667/6507/files/33698128998.pdf
    • https://cdn.shopify.com/s/files/1/0431/5797/9304/files/nujute.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/jimulafipizedov.pdf
    • https://cdn.shopify.com/s/files/1/0431/1161/2578/files/tafadiligetujoxijan.pdf
    • https://cdn.shopify.com/s/files/1/0434/3159/2088/files/liwofodewowiga.pdf
    • https://cdn.shopify.com/s/files/1/0431/3733/5464/files/kutubikudusejez.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tedix.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fc8.bin
690b15cbfc447d01e74e405dcaa1dfbadb33cea89d12b74471bbdcc9a2397c12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC8 4024 bytes
font_01_sfnt_off00007e12.bin
809247cd668471a2ba365251294489f6dc34153845ab07ed50030f097b3c260f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E12 4676 bytes
font_02_sfnt_off00008e16.bin
d6839c90391df8514105e7c180288fc69c9501636c2a2fad61c370bc57e5d36a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E16 12640 bytes

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