Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6bf9edcc53cd37a…

MALICIOUS

PDF

38.0 KB Created: 2020-08-14 09:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef3d73f24f2d1af3dc498c76496f1c38 SHA-1: c42f8a8a4d42b7f0cca3c41bc81e40d4525aeaae SHA-256: f6bf9edcc53cd37a9fdb4f83dd3062cab67678d8035fca44e392e28cac2bf816
130 Risk Score

Malware Insights

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

The PDF was identified as malicious due to its inclusion of a link farm containing numerous external PDF links, a common tactic for SEO poisoning and distributing malicious content. The primary redirector URL, https://ttraff.com/pify?keyword=irregular+past+tense+verbs+worksheets+2nd+grade, is flagged as malicious. While the document body contains text related to 'irregular past tense verbs worksheets 2nd grade', this appears to be a lure to disguise the malicious intent of the embedded links.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=irregular+past+tense+verbs+worksheets+2nd+grade
    • http://zuzewekuk.handsonhexham.co.uk/uploads/1/3/1/3/131398455/vilal.pdf
    • http://vizupivo.fishermanswifelife.com/uploads/1/3/1/6/131637881/1b3850ced1f20.pdf
    • http://xunewun.yorkiefriendsandmore.net/uploads/1/3/2/6/132695615/fb08ce53c2ce.pdf
    • https://cdn.shopify.com/s/files/1/0428/2440/1063/files/introduction_to_calculus_lecture_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/4815/7859/files/84294094212.pdf
    • https://cdn.shopify.com/s/files/1/0437/8922/2045/files/ganashakti_bengali_newspaper.pdf
    • https://cdn.shopify.com/s/files/1/0437/5409/4753/files/gefasuzoligepumow.pdf
    • https://cdn.shopify.com/s/files/1/0433/2745/5387/files/mafibifenox.pdf
    • https://cdn.shopify.com/s/files/1/0431/8006/4936/files/51356902411.pdf
    • https://cdn.shopify.com/s/files/1/0429/5809/4495/files/networking_interview_question.pdf
    • https://cdn.shopify.com/s/files/1/0428/7181/6358/files/tufidive.pdf
    • https://cdn.shopify.com/s/files/1/0428/5045/1623/files/tofisowasizudewe.pdf
    • https://cdn.shopify.com/s/files/1/0435/9539/9325/files/budir.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6335/files/35602921461.pdf
    • https://cdn.shopify.com/s/files/1/0440/8786/9592/files/62205501060.pdf
    • https://cdn.shopify.com/s/files/1/0439/6626/7550/files/wamabofesoge.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_off00005503.bin
61e9c6551dfad4072b11d9002ddf25c53c98e4a88f5d86e4a9426b107fb23681
pdf-font-stream PDF embedded font (sfnt) at offset 0x5503 5644 bytes
font_01_sfnt_off00006839.bin
fa4ed816fabd9894bf363a9831b23f95095eca9e4d2182d0fceda7f2240d971b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6839 10240 bytes