Malicious PDF — malware analysis report

Static analysis result for SHA-256 809bef9ad856608d…

MALICIOUS

PDF

40.9 KB Created: 2020-08-31 02:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5b8c3c5ef809e8ca92d837f86da375a SHA-1: cd1e0196bcde0588dcd2a002fe853760051b5357 SHA-256: 809bef9ad856608d7ecf8115aa268270531f55f345c9b242f01eabe28501f49a
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised as an NFL manual mock draft. The document body is heavily obfuscated but contains the malicious URL and numerous other links to benign PDF files, likely part of a link farm to improve search engine ranking for malicious content. The ML classifier 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/wix?keyword=nfl+manual+mock+draft
    • https://static.usrfiles.com/ugd/b8c837_1f7deda28ff6422481ffdd6e65b38894.pdf
    • https://static.usrfiles.com/ugd/9ec29b_4158edb7dbeb47a3b117b7246f348bde.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5e1b765ff71455fa2a41edc4610bdfc.pdf
    • https://static.usrfiles.com/ugd/913720_7ac2a9bd97a344a787161593e695660e.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3397/files/43787254701.pdf
    • https://cdn.shopify.com/s/files/1/0428/4134/2108/files/57159838216.pdf
    • https://cdn.shopify.com/s/files/1/0431/8268/6362/files/77377097076.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4455/files/nueva_piramide_alimenticia_2020.pdf
    • https://cdn.shopify.com/s/files/1/0459/9218/1919/files/toveturuzizupizenol.pdf
    • https://static.usrfiles.com/ugd/b8c837_588d24831d0d4f7ca37ccbc5fb22e7ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_7046c48c428e4ba9b66b01ef9ae738b3.pdf
    • https://cdn.shopify.com/s/files/1/0431/9304/1053/files/zenozogoweg.pdf
    • https://cdn.shopify.com/s/files/1/0431/7242/9980/files/xepiwiwirememoramarixen.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/golizikedakumeru.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000634d.bin
4bf126788a0d20c5e3ece0b2a41ef8bf054d2dbd10fdad6dae99314ecdca9518
pdf-font-stream PDF embedded font (sfnt) at offset 0x634D 5024 bytes
font_01_sfnt_off00007444.bin
fc6099f5980a5f255f8a2118cb3d5d52bd52d40f0534f1aa1e0df49e335b7665
pdf-font-stream PDF embedded font (sfnt) at offset 0x7444 10060 bytes