Malicious PDF — malware analysis report

Static analysis result for SHA-256 8160f798c78ce78c…

MALICIOUS

PDF

48.8 KB Created: 2020-08-09 20:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb82ff3bf70e3a9e32fa2d3e0713f4a0 SHA-1: c52575751060b8946efa3afef92ab5d72f00835d SHA-256: 8160f798c78ce78c523baf01e40bea052645ba07d37bde66c97eaf9d30e39800
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning attempt. One prominent link, 'https://ttraff.cc/pify?keyword=joint+pdf+probability', is flagged as a malicious redirector, indicating the primary intent is to lead users to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=joint+pdf+probability
    • http://files.holyspiritlv.org/uploads/1/3/1/4/131453253/daguzifesikuk-netenulasiduv-wojot.pdf
    • http://files.idzea.com/uploads/1/3/1/4/131408798/2b6c1d4cf004.pdf
    • http://files.pinkpineapplestudiodfw.com/uploads/1/3/1/8/131856046/9365436.pdf
    • http://files.bhseducationfoundation.com/uploads/1/3/1/3/131383934/982c1abc92bd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/3545/7696/files/words_that_rhyme_with_change.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mitev.pdf
    • https://cdn.shopify.com/s/files/1/0434/7074/9856/files/kojawakujogebejosife.pdf
    • https://cdn.shopify.com/s/files/1/0434/0344/4380/files/andhra_university_distance_education_notification_2020_20.pdf
    • https://cdn.shopify.com/s/files/1/0432/5054/8899/files/vafuxedoxejo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8066/3705/files/resume_for_high_school_graduate.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vemuvuferakodumi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7030/7995/files/pokubup.pdf
    • https://cdn.shopify.com/s/files/1/0428/6224/8095/files/pefaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/6900/6236/files/44465330111.pdf
    • https://cdn.shopify.com/s/files/1/0429/1064/6435/files/maxekokesonudib.pdf
    • https://cdn.shopify.com/s/files/1/0434/6262/3394/files/42970413838.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/50080037861.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_off00007607.bin
09312b2b0191969752a717a7dda11d43e483056449e96d573397654ed15c09b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7607 4756 bytes
font_01_sfnt_off00008632.bin
157dcca2323eda41e80b18b66d4085007d0a6785796c39408d5c06b8541a2a6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8632 10040 bytes
font_02_sfnt_off0000a892.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA892 4324 bytes

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