Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f5e358a7cf6796…

MALICIOUS

PDF

55.4 KB Created: 2020-08-22 12:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce754351c75e0b45e20d511f78a6e42f SHA-1: 856f081a7ab063f998ac36b3ad3e40c2fbcd127d SHA-256: f1f5e358a7cf6796bf7d7cfe5f003bfc3ea88e7fe11dc7ad1e2893d9e9ef7314
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify-hosted PDFs, which is indicative of a link farm designed to manipulate search engine results or distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.cc', which is likely the primary malicious payload delivery mechanism. The document body text, though partially corrupted, contains the same URL, reinforcing its malicious intent.

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=steam+workshop+s+folder
    • http://kakema.nyctutor4kids.com/uploads/1/3/1/3/131380999/fujoxozojegoja-liwup-bifasifizija.pdf
    • https://cdn.shopify.com/s/files/1/0429/1887/1207/files/spanish_accents_practice_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/6003/files/gikunu.pdf
    • https://cdn.shopify.com/s/files/1/0440/1194/6134/files/productos_organicos.pdf
    • https://cdn.shopify.com/s/files/1/0430/4430/7098/files/land_agreement_letter.pdf
    • https://cdn.shopify.com/s/files/1/0435/2904/4127/files/breaking_news_free_template_premiere_pro.pdf
    • https://cdn.shopify.com/s/files/1/0431/3828/5725/files/gibanujujubalelufifuj.pdf
    • https://cdn.shopify.com/s/files/1/0440/6919/1832/files/32504590158.pdf
    • https://cdn.shopify.com/s/files/1/0429/0094/7103/files/kugikunekovi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6271/2734/files/dakasinofema.pdf
    • https://cdn.shopify.com/s/files/1/0435/4719/7594/files/vazofuxudozojapib.pdf
    • https://cdn.shopify.com/s/files/1/0432/4907/4336/files/sasuzutina.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_off000086f2.bin
ef8d8b52585ec56c3661885e786faea2f19d979f18eb6ee5c9d1d4a4ec0a2b54
pdf-font-stream PDF embedded font (sfnt) at offset 0x86F2 5172 bytes
font_01_sfnt_off00009897.bin
855c126678c9435ca7d22dbc4b580ba2102f7446af2b78f76465fb23c11403fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x9897 13240 bytes
font_02_sfnt_off0000c302.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0xC302 4324 bytes