Malicious PDF — malware analysis report

Static analysis result for SHA-256 135c2c94c8752faf…

MALICIOUS

PDF

44.4 KB Created: 2020-08-03 23:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df75eb40e533af7450ef994843fb7819 SHA-1: 7669f41b9a8739c0619ff1e8a83d838918399f26 SHA-256: 135c2c94c8752faf241d405bf3b2182082c69f42ba2ebec43e0d81f5823009df
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination and potentially track victims. The document also functions as a link farm, embedding numerous URLs that point to PDF files hosted on various domains, many of which are benign but some are unknown. The ML classifier strongly indicates maliciousness, and the overall structure suggests a phishing or scam attempt.

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=writing+numbers+in+words+worksheets+grade+3+pdf
    • http://files.byronwashington.org/uploads/1/3/2/7/132710763/wapabozogu-dakolaju-kokirup-tosuguwixeg.pdf
    • http://files.lca-of-tc.org/uploads/1/3/0/7/130738871/1925702.pdf
    • http://palotolo.wintersetumc.org/uploads/1/3/0/7/130775169/7a94ef1e3e4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0439/0954/6136/files/ammie_grace_matalka.pdf
    • https://cdn.shopify.com/s/files/1/0438/4528/8093/files/20786509473.pdf
    • https://cdn.shopify.com/s/files/1/0441/0087/8488/files/76152321876.pdf
    • https://cdn.shopify.com/s/files/1/0434/5023/7085/files/1487038567.pdf
    • https://cdn.shopify.com/s/files/1/0428/3367/4396/files/mogomoziteke.pdf
    • https://cdn.shopify.com/s/files/1/0429/1310/4035/files/73330647229.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6166/files/50283034495.pdf
    • https://cdn.shopify.com/s/files/1/0439/8520/7454/files/jofafodoleme.pdf
    • https://cdn.shopify.com/s/files/1/0430/8402/1921/files/jorijagoz.pdf
    • https://cdn.shopify.com/s/files/1/0443/0397/4556/files/prentice_hall_chemistry_laboratory_manual_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/dudixubebavubuxoxe.pdf
    • https://cdn.shopify.com/s/files/1/0439/9860/9566/files/gewelewa.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_off00005f47.bin
39c627d2eb9d63f53c93e0d504ae0e20dc215b2cb635ba37422c1d2ef8292a97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F47 5780 bytes
font_01_sfnt_off000072df.bin
3ad393dbae1214c2450804ea78855f27da5238673340ca72f0a05a053295b1b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72DF 10396 bytes
font_02_sfnt_off00009670.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9670 4324 bytes

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