Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1891e83b76d83a…

MALICIOUS

PDF

41.2 KB Created: 2020-08-10 19:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a2f975f1adb8ce4a7a74d84e4b65418 SHA-1: ccb6327156b8cd3ce38853670ce98793b30e621b SHA-256: 0a1891e83b76d83a97b29075fdbf0ef139df687c8d20dcda35a95da124989547
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a critical heuristic firing for malicious redirector infrastructure, specifically pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains the same malicious URL and other URLs that appear to be part of a link farm designed to mimic legitimate content. This suggests the primary goal is to redirect users to malicious sites, likely for further exploitation or phishing.

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=best+pdf+to+word+doc+converter
    • http://files.mark-elliott.ca/uploads/1/3/1/8/131856519/zowuf-burox-zezupapezosaf-rogidow.pdf
    • http://wamutub.benmoorestudio.com/uploads/1/3/1/0/131071157/domeg_wovik.pdf
    • http://files.laguminalaw.com/uploads/1/3/1/8/131856392/lupali.pdf
    • http://files.adelaide-pilates.com/uploads/1/3/0/7/130739761/zijupepojumoviziwese.pdf
    • http://files.aryneffert.com/uploads/1/3/1/6/131606670/senapi-voxopo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1905/9868/files/learn_english_via_listening_level_3.pdf
    • https://cdn.shopify.com/s/files/1/0430/7822/1973/files/depim.pdf
    • https://cdn.shopify.com/s/files/1/0437/0979/2407/files/fafaridofekawozezivugot.pdf
    • https://cdn.shopify.com/s/files/1/0429/7015/3113/files/16525829466.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/9475604539.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1637/files/zusikutupopojudosojafugig.pdf
    • https://cdn.shopify.com/s/files/1/0440/1774/6070/files/27165333749.pdf
    • https://cdn.shopify.com/s/files/1/0428/3462/4679/files/xubimedobaropekerijaval.pdf
    • https://cdn.shopify.com/s/files/1/0434/2313/7957/files/75363600219.pdf
    • https://cdn.shopify.com/s/files/1/0439/8697/6926/files/37570929786.pdf
    • https://cdn.shopify.com/s/files/1/0433/4724/7263/files/manual_prctico_de_auditora_interna.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xeniwepisovera.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_off000063f1.bin
c98b92992dcb1c1c329387158a94b28ce5d9673f59a7dc534f5774d47d35ffc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63F1 5108 bytes
font_01_sfnt_off00007586.bin
e2ca18c9c0151724f4af2fbbf187f99e6b46c14a278e471d951c00023b596a50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7586 10120 bytes

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