Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ca3fd233a9d537…

MALICIOUS

PDF

148.8 KB Created: 2020-07-31 23:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8124b0d8a869df2e85d7ed3d828339aa SHA-1: 8d1b1e3808e5554bc43a46c7176714b613f9dc4f SHA-256: 74ca3fd233a9d537daa6fa803f8619a7d6e637ac0b5dcb141302dbcb84790bab
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains text related to R and RStudio, suggesting a lure to trick users into clicking the malicious link. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.
  • 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/pify?keyword=difference+between+r+and+rstudio In PDF document text
    • http://files.edbjohnson.com/uploads/1/3/2/8/132815343/5e6b5b3.pdfIn PDF document text
    • http://files.heartlandirishdancers.com/uploads/1/3/0/8/130813887/da39c47.pdfIn PDF document text
    • http://files.juliansmith.com/uploads/1/3/0/7/130739916/4492149.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/taridulozomoxekolakinuku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8917749958.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0124/9955/files/25713356843.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/kosoxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6397/4805/files/gosukezatejan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0994/9348/files/tazipijolo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9476/8792/files/logogabisuxexudajoxalifos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/24329500546.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1432/3356/files/66070059368.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xiwisabimetabif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9322/0758/files/54915344431.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9338/5633/files/36333893949.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9808/7328/files/50716859295.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3015/1330/files/tegegil.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_off0001ff14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF14 5216 bytes
SHA-256: 70fd80e2fb682bdb681d9ecb830e6d9ffea222c2f30e85e0a9b9a6a9667fc4d5
font_01_sfnt_off000210f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x210F6 16884 bytes
SHA-256: 123d8f7f012479c0bba1888d96f8dba7e08d1fd9a382f10f1311ed4ced771211

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