Malicious PDF — malware analysis report

Static analysis result for SHA-256 57426f74fa74a345…

MALICIOUS

PDF

39.3 KB Created: 2020-08-17 11:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc01cd9a3eb2a5d43a5a47f1f55ec815 SHA-1: 2d407ab74add9f2874b1f84e1e17d3a3aaae3249 SHA-256: 57426f74fa74a3450de1aa50c77eab7d042a072ac99cdc8f62cbf675cf893a70
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of numerous external PDF links suggests a link farm or redirection strategy. The primary attack pattern involves leveraging these links for malicious purposes, potentially for SEO manipulation or to redirect users to further malicious content.

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=gambar+motif+batik+solo
    • http://files.musicdepotrocks.com/uploads/1/3/2/6/132696044/6639480.pdf
    • http://files.itinerantliteratebooks.com/uploads/1/3/1/8/131856188/0dd02b87.pdf
    • http://files.bludahlia.net/uploads/1/3/2/7/132712306/jadefawevasutixa.pdf
    • http://files.legacyiig.com/uploads/1/3/0/7/130776673/jetadorepox.pdf
    • http://files.abhayengineering.com/uploads/1/3/0/7/130740573/2111374.pdf
    • https://cdn.shopify.com/s/files/1/0432/3672/0808/files/bupaxepikuramesabop.pdf
    • https://cdn.shopify.com/s/files/1/0437/5996/0218/files/volibaxigebi.pdf
    • https://cdn.shopify.com/s/files/1/0439/7219/8558/files/free_shatta_wale_music_videos.pdf
    • https://cdn.shopify.com/s/files/1/0428/7492/9319/files/rujikusijudobu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6729/files/48045184568.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2421/files/10201932741.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/90206268776.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_off00005dce.bin
2dd0c955eb56572fb54fbd6ced2d23caf5b215f4c9f663f08ea3fc5d394d3553
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DCE 5148 bytes
font_01_sfnt_off00006f43.bin
7fdac40827e98e843f029dc2d43b1d6d089f6aec38bbdcb4a6cae36052aa4d44
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F43 9816 bytes