Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0f451569d15033…

MALICIOUS

PDF

57.7 KB Created: 2020-08-09 16:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2c9b3f613058257f94490b3049f9291 SHA-1: 31c76d24d1ad9a415fe418eb9019da7a5274d598 SHA-256: 8f0f451569d150336f47e1f27fdc41a53cd3cd178b4f3c7e0e8da4c9f17afc11
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=algebra+rules+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including one to 'https://cdn.shopify.com/s/files/1/0429/7709/9935/files/36366315162.pdf'. The ML classifier also strongly flagged this PDF as malicious. The embedded document body, though heavily obfuscated, contains the malicious URL, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=algebra+rules+pdf
    • http://files.tigerlilyyoga.com/uploads/1/3/0/8/130813860/pomipafalabur_tipemix_jovumutorab.pdf
    • http://files.ecsolutionsph.com/uploads/1/3/2/7/132740270/3635995.pdf
    • http://files.shaareitorahcincinnati.org/uploads/1/3/1/4/131453902/pubomojek.pdf
    • http://files.ecosaint.co.nz/uploads/1/3/0/7/130738716/8855966.pdf
    • https://cdn.shopify.com/s/files/1/0429/7709/9935/files/36366315162.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/farsi_language_course.pdf
    • https://cdn.shopify.com/s/files/1/0433/7526/3909/files/zonadirojuzigenupowetede.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9561/files/39488877536.pdf
    • https://cdn.shopify.com/s/files/1/0434/4181/5718/files/paserilem.pdf
    • https://cdn.shopify.com/s/files/1/0435/3887/4532/files/apc_xs_1300_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/2584/1819/files/51848710676.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61086590007.pdf
    • https://cdn.shopify.com/s/files/1/0430/6878/4791/files/14257885608.pdf
    • https://cdn.shopify.com/s/files/1/0433/3302/5960/files/decrease_size_acrobat_pro.pdf
    • https://cdn.shopify.com/s/files/1/0433/4632/9750/files/23858467244.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/64989875230.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_off00009a1f.bin
db6172e3f667ba548140aaa025a4dd594d920610df530a45170a1bc210c3747c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A1F 5336 bytes
font_01_sfnt_off0000ac52.bin
6e57d13f436bfe5fd152c741d3afe6e99643b06c210757691c257203474ad588		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC52 14268 bytes

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