Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73ac80bb0047ff7…

MALICIOUS

PDF

48.2 KB Created: 2020-10-04 21:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f76c9dbe5b564588c9954d492054ebff SHA-1: 70206bd5c095f2748298a9982ca0965c55c40c1e SHA-256: a73ac80bb0047ff749b00dfd02f124f9471808cebba257ea49ec1d91403cc851
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of numerous external links, many pointing to benign-looking PDFs on strikinglycdn.com, suggests a link farm or SEO poisoning tactic to drive traffic to the malicious URL. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/strik?keyword=fabulous+premium+apk+2020 In PDF document text
    • http://files.olympiaindivisible.com/uploads/1/3/1/4/131437753/befewusixogaro.pdfIn PDF document text
    • http://bedos.thetravelingartistconsortium.com/uploads/1/3/2/6/132681579/vafovagul.pdfIn PDF document text
    • http://files.mclellandpiano.com/uploads/1/3/0/8/130873855/3852714d9d92fcd.pdfIn PDF document text
    • http://files.brokenlandbook.com/uploads/1/3/2/6/132680813/50090bc6989897.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c13162b8-0310-4319-becd-c859a042be82/tojogojav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50af8f58-c242-4bd4-a736-a0f076410e4f/52471449523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53d15ef7-0302-40d6-a807-81344a2d572d/74828194282.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ecfca79-660c-407d-988b-620a45e08972/nusidowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2127071-3d48-4b92-a5ce-5619753e8e34/vekozilip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9a13f7a-44e1-4ff7-8425-307279952cd8/16533377516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da31aece-d038-4d6e-b5f7-688f7daee71b/60467205239.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b78c165e-b8ed-4373-af86-708747a32ced/tixuludirilun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b286f13-dbe2-4b9e-99f5-f0964dcff1be/27423960247.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CBE 5400 bytes
SHA-256: 04490d53439707066e4ca3e42027caccea8bc3077efd8bca49d2a56d49f2da36
font_01_sfnt_off00006ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF7 2328 bytes
SHA-256: 7fd6447464f2b69b53cb3fb373c10a5133b0e7c759bcf9cca545304c0e62c6dc
font_02_sfnt_off000079af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79AF 10292 bytes
SHA-256: efb29d2f11e66cc5064c2d144e51297330687da5610d430748cfe183f329fa92
font_03_sfnt_off00009d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D18 16096 bytes
SHA-256: 3818ad609ee50c1d94dbc61f5d10731946e88c926c1c3751f72a6abad526de54

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