Malicious PDF — malware analysis report

Static analysis result for SHA-256 05fb246b6d328247…

MALICIOUS

PDF

43.3 KB Created: 2020-07-29 06:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e67d985e4c4599247dcf43f4bb757e5 SHA-1: 65970b245e4aff669ef31830c0fb0e607584f610 SHA-256: 05fb246b6d3282479d60f0c0f6e3a0c9d374c810bf03b10b4a45345c93e08e50
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL, 'https://ttraff.ru/pify?keyword=addition+subtraction+multiplication+and+division+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is designed to lead users to harmful content.

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=addition+subtraction+multiplication+and+division+pdf
    • http://files.gustavoacosta.com/uploads/1/3/0/7/130775033/d4609be2041d1.pdf
    • http://files.elmcreeklonghorns.com/uploads/1/3/0/8/130874646/juxugox.pdf
    • http://files.taeyongpark.com/uploads/1/3/0/9/130969012/biwonedutitutilomize.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6134/6466/files/fexegebiwosiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/9581/7382/files/vamimuz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3447/files/73471149459.pdf
    • https://cdn.shopify.com/s/files/1/0439/9307/1774/files/vututifokovudanixiwiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/26747013148.pdf
    • https://cdn.shopify.com/s/files/1/0428/7214/4038/files/27430705785.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6841/files/17242599552.pdf
    • https://cdn.shopify.com/s/files/1/0434/2890/5127/files/modobodekonu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65105912314.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/14490041284.pdf
    • https://cdn.shopify.com/s/files/1/0435/2838/8772/files/genesevaror.pdf
    • https://cdn.shopify.com/s/files/1/0430/4899/2919/files/61928003543.pdf
    • https://cdn.shopify.com/s/files/1/0430/9054/2753/files/kijezalitokituwe.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_off00006ba1.bin
e3b9629bc5c6aad9591fd9320c334b1d89448fb2d14a1f339a64dd04bd6d2005		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA1 5252 bytes
font_01_sfnt_off00007d57.bin
e3f915853ebeb92daf28b3d378bf85d7b5361f18e8a01eb99afd0cd8e9b31981		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D57 9976 bytes

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