Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4783cc34aebf18b…

MALICIOUS

PDF

70.9 KB Created: 2020-10-27 13:19:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 514f885cc8f244c6fd818cfe920625e9 SHA-1: 10b34847cd6b607c5adcb9fd2a93520db92fda2a SHA-256: b4783cc34aebf18b48fc6854e8365bca0bd8c22a78ab6f5bf0b34eb09c0156fb
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to direct users to harmful content. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm strategy, likely for SEO poisoning or distributing malicious links. The presence of numerous embedded links and the ML classifier's high confidence score support the malicious verdict.

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://cctraff.ru/123?keyword=four+levels+of+protein+structure+and+function
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/nebuz.pdf
    • https://xexofomes.weebly.com/uploads/1/3/4/4/134489610/aa453269.pdf
    • https://wirukibit.weebly.com/uploads/1/3/0/9/130969322/8623632.pdf
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/3487778.pdf
    • https://rajomiluti.weebly.com/uploads/1/3/2/6/132682989/mijupomujid.pdf
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/raberuvemosuki.pdf
    • https://zewuxufasebi.weebly.com/uploads/1/3/4/3/134320084/susuzu_razan.pdf
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/molizu-tekaxuvuwoz-xopefupudif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0496/0242/9092/files/valowedukuzolowazos.pdf
    • https://cdn.shopify.com/s/files/1/0437/9534/9661/files/82450065647.pdf
    • https://cdn.shopify.com/s/files/1/0484/7927/3115/files/bagadupebumuli.pdf
    • https://s3.amazonaws.com/jamokaroxoj/92087158478.pdf
    • https://cdn.shopify.com/s/files/1/0430/3441/1157/files/padenobig.pdf
    • https://cdn.shopify.com/s/files/1/0479/6694/5447/files/paweramomapugesid.pdf
    • https://s3.amazonaws.com/henghuili-files/gmo_pros_and_cons.pdf
    • https://s3.amazonaws.com/sugowubuf/butudizale.pdf
    • https://s3.amazonaws.com/zabevog/12488001395.pdf
    • https://s3.amazonaws.com/xanebavifamopez/16505178229.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c274.bin
48d50ab2dcf8abf825cdd39c3c93bd41503da970e5b14f33536d3c82083b02b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC274 5048 bytes
font_01_sfnt_off0000d3b6.bin
906f6a3a8d29930a0a0efac2e8667e88e1c263a58b3f71e1868f22cf028b9eaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B6 12880 bytes
font_02_sfnt_off0000fe04.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE04 4324 bytes

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