Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c156df57a4aea1e…

MALICIOUS

PDF

44.8 KB Created: 2020-08-06 04:40:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17cbe25aac59bdee0fdcb1f906917ff8 SHA-1: 01206d6b1aa287cbba10c5b0da4879a8d438fce6 SHA-256: 2c156df57a4aea1e0341b3c6474150d957210f317ca28439b4e30c5fbd5a110f
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be a link farm designed to lure users to malicious content, likely for phishing or malware distribution.

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=same+meaning+words+in+english+pdf
    • http://files.studio10collective.com/uploads/1/3/2/8/132815054/2277147.pdf
    • http://files.deadbeatphotography.com/uploads/1/3/2/6/132681517/kisolokexusibubovune.pdf
    • http://files.pastorjadeyi.net/uploads/1/3/1/0/131070330/kamorenexujuxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fupibi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5971/4971/files/pasugaludobixo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4509/3533/files/wuperogoposunaza.pdf
    • https://cdn.shopify.com/s/files/1/0440/7531/9448/files/79697760693.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29426312843.pdf
    • https://cdn.shopify.com/s/files/1/0431/0096/2967/files/dejubimirulajexunajodit.pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3708/files/kolop.pdf
    • https://cdn.shopify.com/s/files/1/0430/6727/7469/files/xelurazotajefisizekuju.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/bella_y_bestia_libro.pdf
    • https://cdn.shopify.com/s/files/1/0435/8481/5259/files/vigurozumagudal.pdf
    • https://cdn.shopify.com/s/files/1/0431/0849/9618/files/28285889140.pdf
    • https://cdn.shopify.com/s/files/1/0438/3303/2864/files/pilekule.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_off00006e35.bin
b9f8f711351f28218f930859df5272c5cba9add5ec95f2e3079d75536621bf4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E35 5648 bytes
font_01_sfnt_off0000814f.bin
d9f9033134d3fd38b614b6fe0cac92b8e1be8ade6e3c3652b8bc17e23af836ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x814F 10988 bytes