Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fe830a5473fc93f…

MALICIOUS

PDF

49.7 KB Created: 2020-08-20 19:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f76ef0fcfb84ce14308e7964c363ded5 SHA-1: ba2f0daaca7c5961ba0183bf2f00319e598dc577 SHA-256: 2fe830a5473fc93fadb48b8cdd20b1c9d69d74171393a0fde525f894e7004efc
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on 'cdn.shopify.com'. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and other links, suggesting a lure to a phishing or malware distribution site.

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=credit+report+uk+gov
    • http://files.nollcompliance.com/uploads/1/3/1/8/131872054/mugobubijaxunaxememo.pdf
    • http://files.buyalphabetphotos.com/uploads/1/3/1/3/131379117/zidovoxa.pdf
    • https://cdn.shopify.com/s/files/1/0435/5391/5043/files/al_qaeda_history.pdf
    • https://cdn.shopify.com/s/files/1/0438/1389/6352/files/tolag.pdf
    • https://cdn.shopify.com/s/files/1/0438/3368/8226/files/advanced_cardiac_life_support_guidelines_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/0413/3525/files/pogidanelivexedolubu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2168/0283/files/kufuvivofawarod.pdf
    • https://cdn.shopify.com/s/files/1/0434/5636/4711/files/lijixefuvumasobexaloz.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/vixexerofoxetu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9272/8224/files/20113797405.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9868/files/31874305842.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_off00008765.bin
255d6c17efd4e46a7c88d3d0ad5ef33e2b86992a941ad991411b571a35458f2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8765 4736 bytes
font_01_sfnt_off0000979b.bin
0079b12536b7f4e4e1bf5ce60b6c48953080988a916f5092d2cdf11f137cfae6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x979B 10024 bytes

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