Malicious PDF — malware analysis report

Static analysis result for SHA-256 42fa2d6b52d48e92…

MALICIOUS

PDF

46.0 KB Created: 2020-08-02 02:40:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20620386189a0267a908f7401862b0b5 SHA-1: b8dba3c6931fa52022428fe8f776233203d63417 SHA-256: 42fa2d6b52d48e92ef4bd803d19a0512ed003709c96ddf94648370632ad8b07d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL and a song title, suggesting a lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm designed to obscure the ultimate destination. The ML classifier strongly supports the malicious nature of this PDF.

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=logic+young+sinatra%253A+welcome+to+forever+songs
    • http://files.pennybrumbaugh.info/uploads/1/3/1/4/131453924/gejisubajofewexa.pdf
    • http://files.mrtranhistory.com/uploads/1/3/1/6/131606128/tapewomikurodufu.pdf
    • http://files.rebeccalynnphotography.net/uploads/1/3/0/8/130874518/4840188.pdf
    • http://files.mtbo-commission.com/uploads/1/3/0/7/130775382/nowurafa_vafinikodebuwi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5672/6165/files/filiju.pdf
    • https://cdn.shopify.com/s/files/1/0435/2655/3752/files/lijawusijamulukumenij.pdf
    • https://cdn.shopify.com/s/files/1/0440/6090/1528/files/32074954172.pdf
    • https://cdn.shopify.com/s/files/1/0437/4652/5338/files/72317365531.pdf
    • https://cdn.shopify.com/s/files/1/0435/5896/1315/files/74988534839.pdf
    • https://cdn.shopify.com/s/files/1/0431/4192/2977/files/sozolupojesonu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8196/files/89931247705.pdf
    • https://cdn.shopify.com/s/files/1/0430/8113/8343/files/10945660174.pdf
    • https://cdn.shopify.com/s/files/1/0432/8010/5630/files/54582130656.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/58767089175.pdf
    • https://cdn.shopify.com/s/files/1/0439/4385/4235/files/d_d_5e_monsters_by_cr.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0747/files/parozegab.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_off00007386.bin
711f0a1714f1447fac5c07e5497afdd17282dc5b63aa3b880b5e4b38ec35c755
pdf-font-stream PDF embedded font (sfnt) at offset 0x7386 5448 bytes
font_01_sfnt_off00008625.bin
20e1324c0b93c2aa15d44a191799f1e6d43ebc5d64b643284734d0f8ad376451
pdf-font-stream PDF embedded font (sfnt) at offset 0x8625 10772 bytes