Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cbf85ff3f74c8f…

MALICIOUS

PDF

57.6 KB Created: 2020-08-19 17:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35cbc5ae00d987275be1610964446de4 SHA-1: 49b3b069f3d425b3509b51a52999605cc7e5dbbf SHA-256: 37cbf85ff3f74c8f1138f78ee898ac1c5aa7942cd8dc3e2c769f4b239fcd05a9
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure (ttraff.cc). Another heuristic indicates a PDF link farm, suggesting an attempt to manipulate search engine results or distribute content broadly. The document body, though heavily obfuscated, contains text related to 'dashboard template using angularjs' and the authoring application 'wkhtmltopdf', which is likely a lure. The presence of numerous embedded URLs, including the malicious redirector, strongly suggests a phishing or malware distribution attempt.

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=dashboard+template+using+angularjs
    • http://kelef.playsport-usa.com/uploads/1/3/0/7/130738970/xizojisediligolepega.pdf
    • http://numuti.nicholselectrical.org/uploads/1/3/0/8/130874493/walibegerufinit-relepavu.pdf
    • http://files.makeyourselfageless.com/uploads/1/3/1/4/131482952/8274006.pdf
    • https://cdn.shopify.com/s/files/1/0438/9833/9496/files/adjective_forming_suffixes_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0435/3287/7976/files/sibuninib.pdf
    • https://cdn.shopify.com/s/files/1/0432/5549/6866/files/barreira_hematoenceflica.pdf
    • https://cdn.shopify.com/s/files/1/0436/9580/0475/files/remodaninupato.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70945418412.pdf
    • https://cdn.shopify.com/s/files/1/0428/2767/7852/files/xupidegasaka.pdf
    • https://cdn.shopify.com/s/files/1/0428/8384/2215/files/tedakutofurenitugifur.pdf
    • https://cdn.shopify.com/s/files/1/0435/8563/4463/files/adlerian_therapy_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0435/9503/8877/files/nomozabijavewalax.pdf
    • https://cdn.shopify.com/s/files/1/0435/8995/9843/files/vivadiputujipakemigijedak.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009611.bin
9b91f2bb14d93b3ab3c04eb85cca0b4f52a25f9718944451f25965b040833696		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9611 5472 bytes
font_01_sfnt_off0000a874.bin
49c4432b2d6c4e81eb404374811637d66d6822cb6f654720d6af78a4eb010eb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA874 10116 bytes
font_02_sfnt_off0000cafb.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFB 4324 bytes

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