Malicious PDF — malware analysis report

Static analysis result for SHA-256 f366ec6faa674255…

MALICIOUS

PDF

42.7 KB Created: 2020-07-29 07:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 154982b33ce5e7d4af7a87f1a9a666bd SHA-1: fc4985aecb76fb59dce6fb15a1fba186c43effe2 SHA-256: f366ec6faa674255490a340474044826bb9e89cb2e877bd961da90c8a031afc3
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits a PDF link farm heuristic, indicating a large number of outbound links, many hosted on 'cdn.shopify.com'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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.com/pify?keyword=pyar+badmash+hd+video+song
    • http://files.mountviewcommunitykindergarten.com/uploads/1/3/1/4/131409693/32f241302c5.pdf
    • http://files.snowyriverfarms.com/uploads/1/3/1/4/131408572/ec7a0.pdf
    • http://files.bostonbulldogsrunning.com/uploads/1/3/1/0/131070115/zisow.pdf
    • http://files.johnlalla.com/uploads/1/3/1/4/131453393/nefuxaxikozodiguza.pdf
    • https://cdn.shopify.com/s/files/1/0439/2452/1128/files/8995819743.pdf
    • https://cdn.shopify.com/s/files/1/0435/1547/8176/files/faletiwijebirut.pdf
    • https://cdn.shopify.com/s/files/1/0435/2894/5819/files/88569334549.pdf
    • https://cdn.shopify.com/s/files/1/0430/9889/8592/files/59898504193.pdf
    • https://cdn.shopify.com/s/files/1/0427/4136/6951/files/mugab.pdf
    • https://cdn.shopify.com/s/files/1/0428/4206/3004/files/69310205612.pdf
    • https://cdn.shopify.com/s/files/1/0432/1627/3563/files/87676226442.pdf
    • https://cdn.shopify.com/s/files/1/0429/6412/3814/files/gelafovufojupogerilofidi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4262/6984/files/15287108967.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/6526718247.pdf
    • https://cdn.shopify.com/s/files/1/0433/3033/8966/files/niduvikexexebevemuxevove.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_off00005e7a.bin
82689a9dc619a02ba6fa6742593f2556d793345d6a405abb2a298fcaf0c516c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7A 5216 bytes
font_01_sfnt_off0000700b.bin
c18b6f282cf2ad848ceea9cf37de409e4fbd36fc9aa03585dfbd319d6af98f7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x700B 14656 bytes