Malicious PDF — malware analysis report

Static analysis result for SHA-256 496c834405f7f7a6…

MALICIOUS

PDF

46.1 KB Created: 2020-08-09 09:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2fe9af30e49ad4d6ca12a9e86460ea0 SHA-1: fa1c44151c8a2a7e7252d1e2970ad6e17e7b2fa9 SHA-256: 496c834405f7f7a60f5ffacd54424e95f8724dc75df4fdf33e28b1a964baaa22
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to further malicious sites. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to obscure the malicious destination. No scripts were extracted, and the PDF structure itself is the vector for the attack.

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=medullary+carcinoma+thyroid+pdf
    • http://vewasuzeg.dylanlipke.com/uploads/1/3/1/3/131380213/ruwubegibupi-binonowebo-narojus.pdf
    • http://files.misscookbook.com/uploads/1/3/0/7/130776343/30c78e6bd.pdf
    • http://files.feelgoodafterfifty.com/uploads/1/3/1/4/131453924/domibilolugur-ripip-jawere-zijimatevuzolu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8133/4951/files/labumatefokinagetikiti.pdf
    • https://cdn.shopify.com/s/files/1/0438/3748/9309/files/90280237684.pdf
    • https://cdn.shopify.com/s/files/1/0433/1778/8830/files/nj_driving_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/nakezupimamunuxolivuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/7863/8999/files/adp_self_service_portal_login.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70474217151.pdf
    • https://cdn.shopify.com/s/files/1/0436/4537/0518/files/17263573168.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3358/files/algorithm_acls_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/9961/9492/files/lebozozexisovape.pdf
    • https://cdn.shopify.com/s/files/1/0430/2720/2205/files/87261527553.pdf
    • https://cdn.shopify.com/s/files/1/0431/1308/7142/files/60402913648.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_off00006842.bin
e774e8e6d36438b8a017afb698f3d9cbb0449507c7ae80281d48c7a3b595416f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6842 5204 bytes
font_01_sfnt_off000079c9.bin
57926fdb60a18373b3d7e838237624d9ecda4ddeef9f933c53ff46b950131716		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79C9 10344 bytes
font_02_sfnt_off00009d3b.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D3B 4324 bytes

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