Malicious PDF — malware analysis report

Static analysis result for SHA-256 8492ea5b81d81368…

MALICIOUS

PDF

47.1 KB Created: 2020-08-23 10:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a614f4b61ecf0dced68a861a6a5d841 SHA-1: e57ebdb286a2be74b30b413b1add0698bc52b6f6 SHA-256: 8492ea5b81d813682d3154ca0e26b1a685e381ea1b5058291843a198c1677e7b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.cc'. It also exhibits characteristics of a PDF link farm, embedding numerous external links, many pointing to Shopify-hosted PDFs. The ML classifier strongly indicated maliciousness. The embedded URLs and the nature of the heuristics suggest an attempt to manipulate search engine results or lead users to 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.cc/pify?keyword=claymore+anime+episode+guide
    • http://pijizoj.anthonymichaelscatering.com/uploads/1/3/1/4/131453574/5365013.pdf
    • http://files.newcomers-winstonsalem.com/uploads/1/3/1/4/131438392/3970147.pdf
    • http://files.thejourneywithinus.com/uploads/1/3/1/4/131453132/9a7963423aa91a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72710717911.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pegumi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1361/1413/files/convert_to_monochrome.pdf
    • https://cdn.shopify.com/s/files/1/0432/7879/4917/files/78633288793.pdf
    • https://cdn.shopify.com/s/files/1/0431/7092/2655/files/menire.pdf
    • https://cdn.shopify.com/s/files/1/0432/2410/5124/files/mufimagelepisowafagi.pdf
    • https://cdn.shopify.com/s/files/1/0436/4389/5958/files/nadi_astrology_books_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8447/9641/files/potential_evapotranspiration.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pekazojifedabefotekufof.pdf
    • https://cdn.shopify.com/s/files/1/0437/9885/5840/files/letter_from_santa_template_printable_uk.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_off00006bc3.bin
9cc1f8a90bd7946c01db2f75b6c22763e64eb07a80d9d934a9e376daa7adb1d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC3 4368 bytes
font_01_sfnt_off00007b14.bin
1afd03c2752dbd1053cc4adc90319968f19f4e1d44f2d46a4b7df6aa2ec79611
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B14 5288 bytes
font_02_sfnt_off00008cfd.bin
2abe44b5345c751bbc47f8a814ddafb2f2eb6b3e6c7ccc8219fd16ccd9206725
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CFD 10076 bytes