Malicious PDF — malware analysis report

Static analysis result for SHA-256 deefabd4355c2803…

MALICIOUS

PDF

46.5 KB Created: 2020-10-11 10:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ab6c74969ba9867ccbcc4e45ffae5080 SHA-1: f6151c75208fb9450b05ff843c3cf400fa7d2512 SHA-256: deefabd4355c2803fb99a1f735acdef5dac138b6c027bb030ce02f31d4b24150
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 infrastructure, which is likely intended to lead the user to download malware. The document body also contains a URL that appears to be part of a link farm, potentially for SEO manipulation to increase visibility of malicious content. The ML classifier strongly indicated maliciousness.

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=tvmc+download+for+windows In PDF document text
    • https://site-1036681.mozfiles.com/files/1036681/23062692812.pdfIn PDF document text
    • https://site-1042345.mozfiles.com/files/1042345/69518744983.pdfIn PDF document text
    • https://site-1037160.mozfiles.com/files/1037160/16639441061.pdfIn PDF document text
    • https://site-1042354.mozfiles.com/files/1042354/jifezuwikegamufaluvov.pdfIn PDF document text
    • https://site-1038649.mozfiles.com/files/1038649/mekag.pdfIn PDF document text
    • http://files.neloukeramati.com/uploads/1/3/1/4/131437865/9c251a4090.pdfIn PDF document text
    • http://files.badproductions.net/uploads/1/3/2/6/132683097/5893374.pdfIn PDF document text
    • http://fezezogim.cambridgesupervisiontraining.org/uploads/1/3/2/6/132681337/divef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3897/7429/files/46768719114.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7381/4172/files/60481502310.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8333/3799/files/90142226414.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/6821/2646/files/spanish_pronouns_exercises.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0308/3424/files/zero_order_reaction_rate.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7108/2148/files/algebra_1_regents_august_2014_answers_jmap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3802/7161/files/the_case_for_faith_lee_strobel.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4F 4860 bytes
SHA-256: 061bd881f2ecf63d4131f187589174dd70e10f76b56644a19abdeb8f35c79db2
font_01_sfnt_off00007cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB2 10068 bytes
SHA-256: 4d7e5332428dd699bc15480e2f99ff190b7d14a14d138e415623006259d873ef
font_02_sfnt_off00009f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F21 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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