Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d3edda537268b1…

MALICIOUS

PDF

40.8 KB Created: 2020-09-03 17:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e423813aee6efd337379497dd2972b2e SHA-1: 97cf956d5be08c13d943d3cc8db967cc86737f69 SHA-256: a8d3edda537268b1bef77f6cd73219b6fd5ca29c2b0f929c880b600cf350c40f
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to trick users into clicking it. The presence of numerous external PDF links also indicates a link farm, likely for SEO manipulation or distributing further malicious 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=ad+block+for+android+apps In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/3fc21f_d3da092b555f4d62a99add359b374758.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/bd5c68_29a14002caee4f1098ca2e543fbf67f6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b4609a_ed38d2786843489b8ac27ad18ed3f682.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/362633_783e560a0c7042098996045535911f20.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c068f8_9dfd2bdc7c33446cb87b8db9b01d6785.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2117/1873/files/babua_kahela_rota_hai_bhojpuri_song.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3330/3976/files/metaphys_duel_links_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7035/6637/files/37090805601.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e2f7e1_a73cbef430e74ed69d449263cbceaae2.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c1c462_7659151c30874b7ca5f8d64e7feb8ea7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/585b1d_19c041f9f54d453ba46fd686029b70c6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/067ecb_73638df8eba541ba9997952f2beb9298.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/800b88_04dd9a7f69bd4f90ae510c7f31fdeca2.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61AD 5344 bytes
SHA-256: aade83dc0a64ab7ac43c823e8cd4ea372b654ee275c9ae3d290101f0ba96f943
font_01_sfnt_off000073e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73E7 10204 bytes
SHA-256: dab9bb1ac20238a7ec59156ad714bf0024acf86888cf3c496d31589e5c00ca14

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