Malicious PDF — malware analysis report

Static analysis result for SHA-256 de444f840d8d17dd…

MALICIOUS

PDF

52.2 KB Created: 2020-08-08 02:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0e08fbe16860bc2fcc94d50e032a99d SHA-1: 74307d0b785f9fe27fcce111dfddf60f19a07478 SHA-256: de444f840d8d17dd85d2e21f5cd52cd5abcfd7cddbf425352af8b537a2ad49bb
150 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=blank+biodata+form+pdf+free+download'. The document body, though partially corrupted, suggests a lure for a 'blank biodata form pdf free download'. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm designed to improve SEO for malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=blank+biodata+form+pdf+free+download
    • http://files.shiftwideopen.com/uploads/1/3/0/8/130874067/zimalogiwuler.pdf
    • http://files.dallassigmas.com/uploads/1/3/0/7/130775197/tuvugo-wokes-maxam-junaxulone.pdf
    • http://files.austincst.com/uploads/1/3/1/4/131453823/nesunujonufeg.pdf
    • http://files.southtownscatholic.org/uploads/1/3/1/6/131636990/3996155.pdf
    • https://cdn.shopify.com/s/files/1/0437/6195/9070/files/angola_civil_war.pdf
    • https://cdn.shopify.com/s/files/1/0440/3278/6597/files/30095748989.pdf
    • https://cdn.shopify.com/s/files/1/0430/0043/0746/files/sotivigonoxerepoxemewido.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gibowutobarifokegibig.pdf
    • https://cdn.shopify.com/s/files/1/0434/1111/2092/files/48822948183.pdf
    • https://cdn.shopify.com/s/files/1/0428/4956/6886/files/kijibagatumas.pdf
    • https://cdn.shopify.com/s/files/1/0433/0074/9467/files/29566920097.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6857/files/77510744456.pdf
    • https://cdn.shopify.com/s/files/1/0435/4319/9898/files/raseruvozuve.pdf
    • https://cdn.shopify.com/s/files/1/0438/7084/7131/files/jajaxuxov.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6780/files/zinorimokegosegoraxijok.pdf
    • https://cdn.shopify.com/s/files/1/0428/0087/3631/files/galilunakej.pdf
    • https://cdn.shopify.com/s/files/1/0433/5599/6328/files/37180074757.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_off00008403.bin
ff5e0b0e09041d3863dc911ea405ddc2272598af4c3de915bba980028495002f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8403 5356 bytes
font_01_sfnt_off00009635.bin
022d5dfab9ff25847924bed024592e1121be1c49979e8e1c51607c0a8440c3b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x9635 13812 bytes