Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a65a17755a98bc2…

MALICIOUS

PDF

47.2 KB Created: 2020-09-05 13:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 728feaa5c064267f7654c4b034be216a SHA-1: b90f883ce28bd2eedfc78e8b299d199c6c3c3358 SHA-256: 6a65a17755a98bc27f41cd6430e9b0dc84162aaac25ad8305a03d1aed0704f3b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially garbled, contains the URL 'https://ttraff.ru/wix?keyword=link+external+css+stylesheet+html', which is flagged as a malicious redirector. Additionally, the PDF is part of a link farm, suggesting an attempt to drive traffic to potentially 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/wix?keyword=link+external+css+stylesheet+html 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/b8c837_d82431258d294cb28df6f2b71e44f2a7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/99a8f2_108f8174874b41118898f2388ae50130.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/493135_805fe0ff47254d378ad604d206a61df1.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/65d6f7_0d338844dc834375a940fd38b2f25e42.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/51c472_ec502d8563e84b2caff150e4df1a5b0d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_69ac3770fcc0410eac93eacff9e17f07.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/70e5f7_09c9970a947e40d58a5124dbb8eceed8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a18aa6_92de575a5c924bc2ac3037cee260c993.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/05301a_76e5068004104d8f953c65a6322c49fc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4333/2000/files/physics_formulas_pdf_for_eamcet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1031/0822/files/meiklem_kiln_works_facebook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/2024/7194/files/crystal_report_for_visual_studio_2013_express.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/8841/6669/files/motorola_n136_manual.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9c8fb9_9ff8a94147394a17b1a317fc5a6679aa.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7a359d_531c1deb1757409cb1bc9bc0fb2abad7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/353d00_65d39a1b03de4a4b910cce0152d675a3.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/1e557c_8a93d96a1d3e4ce39acc9fc5362f830a.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_off00007394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7394 5216 bytes
SHA-256: 014a1b45866bae9bb07498983a9b502e81fa5ebfa6ea5b19cb559ac6256f9531
font_01_sfnt_off00008531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8531 13172 bytes
SHA-256: 43c4f6ae0e69234ef238b7ef048db429f3cd2fab48a758b5070da9c75ea91d65

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