Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb20c58ff5cff1db…

MALICIOUS

PDF

42.1 KB Created: 2020-08-01 19:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5369569b64ab95eb17d404996a73683 SHA-1: 67328db09f0c5f0091fd1094b140b163656b6e06 SHA-256: cb20c58ff5cff1dbde3849199dc8527b1cf644d81b69bdee97820089c2bd8fa4
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, specifically pointing to 'https://ttraff.cc/pify?keyword=2017+postage+rate+chart'. This indicates the document's primary purpose is to redirect users to malicious infrastructure, likely for phishing or malware distribution. The presence of a large number of external PDF links, many hosted on Shopify, further suggests a link farm or SEO poisoning tactic to obscure the malicious redirector. 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=2017+postage+rate+chart
    • http://files.melvinmorsemd.com/uploads/1/3/1/4/131453399/634181.pdf
    • http://files.bhgs.org.uk/uploads/1/3/0/8/130814397/898654.pdf
    • http://files.alekstinapoodles.com/uploads/1/3/0/7/130776519/4314976.pdf
    • http://files.cadellcabins.com/uploads/1/3/1/4/131408970/5109691.pdf
    • http://files.conditionsforlearning.com/uploads/1/3/0/8/130873958/8351454.pdf
    • https://cdn.shopify.com/s/files/1/0433/9708/7390/files/7755442510.pdf
    • https://cdn.shopify.com/s/files/1/0431/6934/9794/files/86354609640.pdf
    • https://cdn.shopify.com/s/files/1/0436/3550/7358/files/22949761767.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/31778335304.pdf
    • https://cdn.shopify.com/s/files/1/0432/2823/3887/files/vagodotowafipugalavekon.pdf
    • https://cdn.shopify.com/s/files/1/0435/3127/2351/files/91353722032.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/tiwipodogemikukojak.pdf
    • https://cdn.shopify.com/s/files/1/0432/2125/4312/files/61721900682.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1924/files/97516274754.pdf
    • https://cdn.shopify.com/s/files/1/0435/6859/5112/files/40423285777.pdf
    • https://cdn.shopify.com/s/files/1/0431/5483/3564/files/suzeniguzitoxo.pdf
    • https://cdn.shopify.com/s/files/1/0438/2595/4973/files/30806149984.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_off00006642.bin
5d78425bc890804b5f2a0c66066876e484e3ec3e82272d23b7e861c7c40e0124		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6642 5476 bytes
font_01_sfnt_off000078e3.bin
4f396a6d70c873c482cbdaac69d47c98a5ee748b215017ffcf7074030703583d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78E3 10168 bytes

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