Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf4607c14447086…

MALICIOUS

PDF

41.1 KB Created: 2020-08-05 23:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6eac7b9c587b2e2eafcaa32cc5f3165 SHA-1: 68bcb7ae6ec84f4bca3b2d6079edc9f197deeca9 SHA-256: 6bf4607c144470866c866b70714e9b9c481e35e700a165357d83e3ab8861c77a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=set+associative+mapping+in+cache+memory+pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains references to academic topics and financial statements, likely intended to disguise the malicious intent of the embedded links.

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=set+associative+mapping+in+cache+memory+pdf
    • http://files.joanieandjennib.com/uploads/1/3/1/6/131636941/devagope-bofidukomud.pdf
    • http://files.poja-collection-microscopic-anatomy.com/uploads/1/3/0/8/130874381/fupuwuve-wujejivebelo-jowegilatimudiv.pdf
    • http://files.ownbeachrentals.com/uploads/1/3/1/4/131406840/9534838.pdf
    • http://files.missourivalleychristianschool.org/uploads/1/3/0/7/130775368/jomosatenipomap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2177/0657/files/fillable_personal_financial_statement.pdf
    • https://cdn.shopify.com/s/files/1/0432/3845/7501/files/44536326218.pdf
    • https://cdn.shopify.com/s/files/1/0429/3358/4028/files/fogowiserokesuzobo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/69951486748.pdf
    • https://cdn.shopify.com/s/files/1/0436/5615/1190/files/33041161792.pdf
    • https://cdn.shopify.com/s/files/1/0429/0835/2679/files/loduvikerawote.pdf
    • https://cdn.shopify.com/s/files/1/0430/9676/8661/files/sofilixirorogixuwamofi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1095/7210/files/razedezelumavozozizus.pdf
    • https://cdn.shopify.com/s/files/1/0436/8151/3622/files/98261410013.pdf
    • https://cdn.shopify.com/s/files/1/0435/9690/6659/files/apostrophe_for_possession_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/4826/4089/files/denadelogedoxo.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/xexukexunufogomupat.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006238.bin
43ff89ddd5ec79b355b978fa48da1602d89e7e0c7ed4f4a80f10390e94c67812		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6238 5804 bytes
font_01_sfnt_off000075e0.bin
132e0c2c888453553687fd8b5ff4cf8786db361cba39dad3250e1d72626e5347		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75E0 9900 bytes

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