Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e13c9b346816a5…

MALICIOUS

PDF

33.9 KB Created: 2020-08-23 09:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79ef3d90aafb05b020620c79e6600d14 SHA-1: 2a4dbc2069e3adfaf01140a2962c776ee6812cb2 SHA-256: b2e13c9b346816a5eb4a3c5e7e29e9272db9fa84fc2f69f9430bd9e2d8d2d56f
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one pointing to a known malicious redirector. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user consumption. The primary function seems to be acting as a link farm, potentially to distribute malicious content or manipulate search engine results.

Heuristics 3

  • 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.
  • 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=section+2.+1+classifying+matter+answers
    • http://korinewa.natureswaylabradorpups.com/uploads/1/3/1/3/131380505/1252908.pdf
    • http://files.trackingclubofma.com/uploads/1/3/0/7/130738993/5062284.pdf
    • https://cdn.shopify.com/s/files/1/0435/7960/5147/files/gifiregafugipenepeja.pdf
    • https://cdn.shopify.com/s/files/1/0437/7447/6440/files/nisinuxin.pdf
    • https://cdn.shopify.com/s/files/1/0436/2518/5442/files/business_information_systems_books.pdf
    • https://cdn.shopify.com/s/files/1/0438/4276/4962/files/84451348754.pdf
    • https://cdn.shopify.com/s/files/1/0435/1698/5503/files/92874558536.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3899/files/bivanepufuvuwixuro.pdf
    • https://cdn.shopify.com/s/files/1/0430/5849/5639/files/96843042886.pdf
    • https://cdn.shopify.com/s/files/1/0428/4815/7859/files/30302791156.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/boxowelotofuva.pdf
    • https://cdn.shopify.com/s/files/1/0429/7529/7689/files/macroeconomics_hubbard_4th_edition.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_off0000478b.bin
97da4df3c893f7c717133aa8cc65c6d04bb55c69d337bdb78bb29a0650c3aaee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x478B 5712 bytes
font_01_sfnt_off00005b00.bin
46def88f4d4c34f5e4e3ffefc94fa3b8c7a8585e9e7b16839cee3c69a4e745fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B00 9388 bytes

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