Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c81e58459f26c62…

MALICIOUS

PDF

50.8 KB Created: 2020-08-05 01:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9006bafacfa12f0885a82bc31b7efba SHA-1: 6d164c1ba15e3ebe43498b3f4a6766f3b7e0e58a SHA-256: 1c81e58459f26c6226dbefbcd724462d2d5aff1203e55605fd9622e57d6b27ba
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier as malicious and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector service, ttraff.ru, which likely serves as a gateway to a malicious payload. Another critical heuristic indicates a large PDF link farm, suggesting an attempt to manipulate search engine results or distribute content through numerous benign-looking links. The presence of these elements strongly suggests a malicious intent, 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.ru/pify?keyword=ccsp+certification+book+pdf
    • http://files.alpinespringscounseling.com/uploads/1/3/0/9/130969054/rulolakojujiz.pdf
    • http://files.valhallavalley.com/uploads/1/3/1/4/131438557/b4cb6.pdf
    • http://files.hypnobabiesboston.com/uploads/1/3/0/7/130739519/zosup.pdf
    • http://files.addeumsubdivision.com/uploads/1/3/0/7/130739318/nojebukujidi.pdf
    • http://files.forensicarts.org/uploads/1/3/0/7/130775402/5774412.pdf
    • https://cdn.shopify.com/s/files/1/0437/3400/7973/files/car_engine_parts_and_functions_with_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0435/2992/8872/files/discord_formatting_color.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jenodilibaxu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94323725826.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37144816260.pdf
    • https://cdn.shopify.com/s/files/1/0431/7492/0347/files/libibijoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0643/5232/files/gimapukelojiju.pdf
    • https://cdn.shopify.com/s/files/1/0434/0652/4583/files/48701016109.pdf
    • https://cdn.shopify.com/s/files/1/0439/7400/0798/files/24429753114.pdf
    • https://cdn.shopify.com/s/files/1/0433/9128/7450/files/6263713981.pdf
    • https://cdn.shopify.com/s/files/1/0434/0904/7717/files/fokegeresiwajomi.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_off000086ab.bin
1a8045aeb2f5a020eb615895b5847e1bd74e1af5965d409690c4e5d433fbf4ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86AB 5228 bytes
font_01_sfnt_off00009879.bin
e240f1e45e2953fdebe39ad400e07d96468adb1d1f3641f4cd671401938421df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9879 11148 bytes

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