Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6de2e102eb4fb6…

MALICIOUS

PDF

39.8 KB Created: 2020-07-28 06:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9b9b2b4ccf9013cfb9f70d2d8a8b56e SHA-1: d35b74992d5f4707cd9627bde96a93e816d778a5 SHA-256: 3f6de2e102eb4fb64cf5a0e16f53173979fe4660273fcdfadf51a2c35901e0fa
152 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 a redirector service (ttraff.cc) known for malicious activity. The document body is heavily obfuscated, but the presence of 'algebra worksheets ks3' suggests a lure. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the intent to create a link farm, likely for SEO poisoning or to distribute malicious content via benign-looking Shopify URLs.

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=algebra+worksheets+ks3
    • http://files.svcmblackmountain.org/uploads/1/3/0/7/130776594/pavobodakin_woxumisebosipa_wawerusuroxu_gufeb.pdf
    • http://files.jflesher.net/uploads/1/3/0/8/130874610/pavizezus-moduge-bopetolalub.pdf
    • http://files.yeagershairstudiospa.com/uploads/1/3/0/7/130739069/8593748.pdf
    • http://files.sgionet.com/uploads/1/3/0/8/130874413/zujojunejiguwimurob.pdf
    • http://files.learninglives.co.uk/uploads/1/3/1/3/131380618/362727b5.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/vijexilijodetuxekepoluw.pdf
    • https://cdn.shopify.com/s/files/1/0439/3975/8235/files/vusuremawosujarowapur.pdf
    • https://cdn.shopify.com/s/files/1/0432/6536/0034/files/fajupewomuvux.pdf
    • https://cdn.shopify.com/s/files/1/0431/9199/2481/files/63405174688.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7070/files/20296967370.pdf
    • https://cdn.shopify.com/s/files/1/0431/0922/0501/files/34488852674.pdf
    • https://cdn.shopify.com/s/files/1/0436/4258/5241/files/zufegidogeduzi.pdf
    • https://cdn.shopify.com/s/files/1/0435/8835/4207/files/podisejivelepabovovepimub.pdf
    • https://cdn.shopify.com/s/files/1/0434/1858/3192/files/jumaluzabatadodufivuwiwin.pdf
    • https://cdn.shopify.com/s/files/1/0427/7541/2902/files/5849975880.pdf
    • https://cdn.shopify.com/s/files/1/0434/2969/1558/files/noveb.pdf
    • https://cdn.shopify.com/s/files/1/0434/7317/4680/files/17788906437.pdf
    • https://cdn.shopify.com/s/files/1/0433/2008/2590/files/famifezolijiposedidibig.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_off00005f1c.bin
dafe520c572a58ca3adfabfe19440ec447f3e2fc95d51aefd94352ddd8adb083		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1C 5032 bytes
font_01_sfnt_off00007061.bin
92094eae009f02d25bb32533891dd8d6a79d6ebd25032d118d1aa8d098ac3b02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7061 9904 bytes

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