Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5ac73130d83602…

MALICIOUS

PDF

47.8 KB Created: 2020-08-01 18:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32a88959c2515520e2320d651e188538 SHA-1: 0aa207934b110b5798cc2929a8ea6f4a89861485 SHA-256: 7b5ac73130d83602e91edea186d567eb3aa3925d9cdb83580f5111ab9e4be8c5
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links, many of which lead to a redirector service. The document body contains a URL that points to this redirector, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting users to potentially harmful content through a link farm.

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=simple+html+game+code
    • http://files.heliosphotomedicine.com/uploads/1/3/1/0/131070080/c6d20501c7cb8b0.pdf
    • http://files.matrixalgorithmsinmatlab.com/uploads/1/3/2/6/132683181/rimojed-boferer.pdf
    • http://files.christ-presbyterianchurch.org/uploads/1/3/1/4/131483108/sezubipapojibip_rowogefakej_tixap_wubedefevaxila.pdf
    • http://files.barch.com/uploads/1/3/0/8/130814605/xukafi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7697/5768/files/98344849333.pdf
    • https://cdn.shopify.com/s/files/1/0430/5377/7047/files/zugubepipok.pdf
    • https://cdn.shopify.com/s/files/1/0428/5943/0054/files/masesadubor.pdf
    • https://cdn.shopify.com/s/files/1/0431/2678/4157/files/rutetasepifupav.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8865/files/zanofenogesekedaja.pdf
    • https://cdn.shopify.com/s/files/1/0432/9105/0137/files/73472942915.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/mijaxepijanofutorireridu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94766401197.pdf
    • https://cdn.shopify.com/s/files/1/0435/8910/7869/files/65646007202.pdf
    • https://cdn.shopify.com/s/files/1/0428/6903/1078/files/90019964167.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_off000062c4.bin
5e55706489d491707e68525a209fc994810fb21c00d2337664b5069470f5e717
pdf-font-stream PDF embedded font (sfnt) at offset 0x62C4 5316 bytes
font_01_sfnt_off000074ae.bin
3ce7d3ceeccd846f833e34f931d63e068bdb13f3a18e5ee2dea761609e5a5142
pdf-font-stream PDF embedded font (sfnt) at offset 0x74AE 21772 bytes