Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ff10c2983e5834…

MALICIOUS

PDF

48.6 KB Created: 2020-09-06 05:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1049dec546396d5d449bcca2fcd75ff0 SHA-1: 2cc813613a6d52b8e2302f9695e0e3ea3b0556ab SHA-256: 33ff10c2983e583425a459930d2369495edb4f6433dad21e9d98f2d15e4f8b86
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.link'. The document body, though heavily obfuscated, contains the same URL and references a steering wheel control interface installation manual, likely a lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, suggesting a broader campaign to distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.link/wix?keyword=axxess+steering+wheel+control+interface+installation+manual 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/1cc777_157fda5da93a496e9fb5b54ff9591c05.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_8c369762975a41ddad84b8131cc23851.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_903caf40da2c4745b178f218f357d188.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/902d29_57b08290e8ab4302b072a33e83c959cd.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/24deb6_28de1afb68264eeea35b2b89a6f8a0c5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/05900a_ed65a119526d4082a916b197bfa28c2d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/432b07_98ffe20d288745c7b9a1bdfe23ed3381.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/df73ab_f1aeae3bde854b0788a6487182b4b3a5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/16a96a_bd537d6bc812473cba34c471016bb414.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3fc21f_6c9998a357aa45c9a07388486318e8b3.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/097bd5_dd61b76ca53645dc8143159430f6b950.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/479fa9_2ff7245b060d49c6a64d5d9dada5e8df.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4cfbbd_a71376c29bbe4c6382aa60f8b990a6e0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6240f8_dc3752c3feb64e8587ef1478f7dd8aa6.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/pixadejogosu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6517/0334/files/biblia_de_jerusalen_de_estudio.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_off00007ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED3 5444 bytes
SHA-256: f104a02fdfa41c20f54e9e9d2be37271e9316425384cdb769b93e72f4dea1b31
font_01_sfnt_off0000914b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x914B 10304 bytes
SHA-256: b16a839cd856f1cfeabebb563c8ea7705629836426101dc7dd8492585e7686da

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