Malicious PDF — malware analysis report

Static analysis result for SHA-256 74cf4b8214ecd0dc…

MALICIOUS

PDF

40.3 KB Created: 2020-08-16 21:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f98f0977cdbf5f64ebff8b200f23eb72 SHA-1: dde95e3d737566d2e4766c5cd93419caac499297 SHA-256: 74cf4b8214ecd0dcfe25fc2332bd6056b7a1f8be1e82ebf432055ec2cf541b1a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination and potentially engage in SEO poisoning or phishing. The document body, though heavily obfuscated, contains references to the redirector URL and a large number of other PDF links, suggesting a link farm or content manipulation strategy. 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=casio+fx+95ms+manual
    • http://files.nokomispl.org/uploads/1/3/1/3/131381602/f9808f0f7cfc28.pdf
    • http://files.mustardfitness.com/uploads/1/3/1/4/131413718/sujezaraj-vimuzuzawub-begukiwojuxu.pdf
    • http://files.themassageplaceop.com/uploads/1/3/2/7/132710779/vawujem-zimagewa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/8595/3192/files/35318057651.pdf
    • https://cdn.shopify.com/s/files/1/0431/6325/4944/files/gogadepotoruz.pdf
    • https://cdn.shopify.com/s/files/1/0431/2550/6208/files/56351426124.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/11527013835.pdf
    • https://cdn.shopify.com/s/files/1/0431/0056/9766/files/autodesk_viewer_for_mac_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/5811/8312/files/10156650787.pdf
    • https://cdn.shopify.com/s/files/1/0437/6150/0309/files/86806736435.pdf
    • https://cdn.shopify.com/s/files/1/0431/6830/1212/files/52930242020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9495/0556/files/93415293576.pdf
    • https://cdn.shopify.com/s/files/1/0432/9901/2766/files/lorofopukawekebifenefijan.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fef.bin
5dc2930f9e8d3dabc58f223499175cbacef1228d1a7b0fef1b2b5ee2764c87db
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEF 5068 bytes
font_01_sfnt_off00007122.bin
db68c3b225e5134994e7475b533ff0b71f435773d80c5e2f4f4c1c72664bf07e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7122 10464 bytes