Malicious PDF — malware analysis report

Static analysis result for SHA-256 c674c6d82fa64990…

MALICIOUS

PDF

34.1 KB Created: 2020-08-02 22:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f8d101ec763cf2047b3d46225e9ea6d SHA-1: 958f5dfe6344a246cd0e48e00cebf231f0a7f347 SHA-256: c674c6d82fa6499015c3b4068e55f8ec716eb9d2bfdb9b087d90f10304f442fd
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a link farm, and the ML classifier strongly suggests maliciousness. The primary attack pattern involves luring users through these links, likely to a phishing or malware distribution site. No scripts were extracted from this sample.

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=tear+of+tilloa
    • http://files.newrootspress.ca/uploads/1/3/1/3/131382841/8659245.pdf
    • http://files.5fingersand10toes.com/uploads/1/3/1/4/131406684/buzazatulozagedig.pdf
    • http://files.laurajdavis.com/uploads/1/3/2/7/132740485/kitepunonibu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5633/9871/files/56472099340.pdf
    • https://cdn.shopify.com/s/files/1/0434/4945/0661/files/rosekiv.pdf
    • https://cdn.shopify.com/s/files/1/0437/3282/8314/files/97540062572.pdf
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/dutekasarexukoloruwijomo.pdf
    • https://cdn.shopify.com/s/files/1/0436/0483/6515/files/7385641867.pdf
    • https://cdn.shopify.com/s/files/1/0431/5611/1520/files/57998743152.pdf
    • https://cdn.shopify.com/s/files/1/0432/3767/1080/files/jafup.pdf
    • https://cdn.shopify.com/s/files/1/0437/2529/1674/files/26401880984.pdf
    • https://cdn.shopify.com/s/files/1/0430/8336/6551/files/muxogukuzigivur.pdf
    • https://cdn.shopify.com/s/files/1/0431/2442/4853/files/45571809593.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2250/files/vekofud.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/visiju.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6184/files/xekakalejavonol.pdf
    • https://cdn.shopify.com/s/files/1/0439/3716/9576/files/vududibisurobimoridapop.pdf
    • https://cdn.shopify.com/s/files/1/0430/4168/5665/files/vonuzotanawijagub.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_off00004963.bin
fc241f7e3425be7a6ae5c5458215a92e462e08c0ff2c5a9bb6e1e8df7f5d066b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4963 4532 bytes
font_01_sfnt_off000058db.bin
2f84fbe30354f294d6f47b8301cfa7ba717cf8091e3760a7e6167acce85beaa6
pdf-font-stream PDF embedded font (sfnt) at offset 0x58DB 10148 bytes