Malicious PDF — malware analysis report

Static analysis result for SHA-256 e167a203ae8c536a…

MALICIOUS

PDF

40.0 KB Created: 2020-08-24 09:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d5285485f48358a8e8a067b3134d730 SHA-1: 667653a456cffb9a9f376673644d274fe147db39 SHA-256: e167a203ae8c536a10a1db9bd67985f248b25f196e50355a6e1052f5ad6352d3
152 Risk Score

Malware Insights

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

The PDF contains a high density of external links, many pointing to Shopify domains, but one critical link redirects through 'ttraff.cc', a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'electronic measurements and instrumentation textbook pdf' and the redirector URL, suggesting a lure to download or access malicious content disguised as an academic resource. The ML classifier also strongly indicated maliciousness.

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=electronic+measurements+and+instrumentation+textbook+pdf
    • http://files.benjaminsmithfineart.com/uploads/1/3/2/7/132740778/bda5c0dc689c834.pdf
    • http://segufad.victordivine.com/uploads/1/3/1/6/131606346/6891835.pdf
    • http://rakar.lennyvuitton.com/uploads/1/3/1/6/131607600/8689547.pdf
    • http://files.happytailspets.co.uk/uploads/1/3/0/8/130814631/jasepuji.pdf
    • https://cdn.shopify.com/s/files/1/0432/2033/6802/files/92524402998.pdf
    • https://cdn.shopify.com/s/files/1/0434/2471/0807/files/wuwixezaludirejifamigumeg.pdf
    • https://cdn.shopify.com/s/files/1/0437/2761/8209/files/padma_awards_2020_list_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0811/4340/files/30th_birthday_invitation_templates_word.pdf
    • https://cdn.shopify.com/s/files/1/0434/8873/9494/files/41673264333.pdf
    • https://cdn.shopify.com/s/files/1/0432/7797/5717/files/9421818420.pdf
    • https://cdn.shopify.com/s/files/1/0435/5509/4689/files/basketball_game_app_free.pdf
    • https://cdn.shopify.com/s/files/1/0463/0960/5541/files/award_certificate_templates_free_printable.pdf
    • https://cdn.shopify.com/s/files/1/0428/8125/3535/files/zebisebizejevilurof.pdf
    • https://cdn.shopify.com/s/files/1/0434/6819/3952/files/23941187507.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053f5.bin
386d8d2b83a7db88f9b53f48d57b33b5178243349fbd4741ed50f8bf07caa0f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53F5 5532 bytes
font_01_sfnt_off00006698.bin
33d80b5e357abfa3ea91f5eff18928953f8e36d8e9a7aea158c838e8ae756dd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6698 2116 bytes
font_02_sfnt_off00007061.bin
4227a0dd7716f7a95337a6bf015d9e7a5bef91d9fc9f67c712eabc62dcadc1e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7061 9948 bytes

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