Malicious PDF — malware analysis report

Static analysis result for SHA-256 c214a159a43ce6c8…

MALICIOUS

PDF

43.2 KB Created: 2020-08-06 14:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2345ce2178d5d99950fc31917f076272 SHA-1: c500fef0b151cebcd2924774917ed9a1159e4ba4 SHA-256: c214a159a43ce6c85ee3984753a72fd7ac17ce773ec5839ebc9213869362387f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to shopify domains hosting other PDFs, but one prominent link redirects through 'ttraff.ru', a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Ielts general writing task 1 topics pdf' and the malicious redirector URL, suggesting a lure to trick users into clicking on the malicious link. The ML classifier strongly flagged this PDF as malicious.

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=ielts+general+writing+task+1+topics+pdf
    • http://files.s1gkusa.com/uploads/1/3/0/8/130873942/neduxitum.pdf
    • http://files.extreme-kids.com/uploads/1/3/0/9/130968994/debufapekuwen.pdf
    • http://files.jakeryancreations.com/uploads/1/3/1/3/131380916/4314840.pdf
    • https://cdn.shopify.com/s/files/1/0431/2779/9957/files/sony_rx100ii_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6232/files/vijajorerogixidipaxib.pdf
    • https://cdn.shopify.com/s/files/1/0435/9605/4690/files/98173329096.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/jirizaxipikuziletine.pdf
    • https://cdn.shopify.com/s/files/1/0432/0644/3176/files/rirodoludaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4965/files/pover.pdf
    • https://cdn.shopify.com/s/files/1/0429/0641/9367/files/felat.pdf
    • https://cdn.shopify.com/s/files/1/0434/2359/6693/files/19491986521.pdf
    • https://cdn.shopify.com/s/files/1/0434/7196/2265/files/dewopamiwom.pdf
    • https://cdn.shopify.com/s/files/1/0434/2926/5574/files/44457497521.pdf
    • https://cdn.shopify.com/s/files/1/0434/5308/7911/files/76424321173.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4965/files/58444068296.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6744/files/28515722642.pdf
    • https://cdn.shopify.com/s/files/1/0436/9183/5546/files/febisilipasizilagotedotew.pdf
    • https://cdn.shopify.com/s/files/1/0434/1451/9973/files/55007446148.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_off00006a91.bin
8d9331f2130a67790aee695a2927ed11c7b55d0f06be9a1f8f4133cd3acb618f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A91 5468 bytes
font_01_sfnt_off00007d57.bin
6b3263bcbd1ea85bf5bd8b60f0b99751d75f7d13577112ee0b3507c6ce0083a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D57 10012 bytes

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