Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7431d3ec460acf9…

MALICIOUS

PDF

42.0 KB Created: 2020-10-07 01:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c589507a621b9a71deb14ab4c15765cb SHA-1: e623ed6e49d1f7310db0589d2d6de5a5a6c6ed3c SHA-256: a7431d3ec460acf935d823e6fc343fe7f56ef62df84ed1e6a402ffe0e61709b5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://gettraff.ru/strik?keyword=girl+from+ipanema+sheet+music' and references to other PDF files, suggesting a link farm or SEO manipulation tactic. The ML classifier also 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://gettraff.ru/strik?keyword=girl+from+ipanema+sheet+music In PDF document text
    • http://geluwemo.olivetreeyoga.net/uploads/1/3/0/8/130873782/ganesorulukewu.pdfIn PDF document text
    • http://files.reclaiminghopecounseling.com/uploads/1/3/0/7/130739693/8538372.pdfIn PDF document text
    • https://site-1037010.mozfiles.com/files/1037010/taras.pdfIn PDF document text
    • https://site-1038595.mozfiles.com/files/1038595/7392989273.pdfIn PDF document text
    • https://site-1036625.mozfiles.com/files/1036625/xurituve.pdfIn PDF document text
    • https://site-1042442.mozfiles.com/files/1042442/zadalulebexawow.pdfIn PDF document text
    • https://site-1041405.mozfiles.com/files/1041405/josemim.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/1/0481/3334/1347/files/improvised_ranged_weapon_pathfinder.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0345/1813/files/best_electric_cigarette_rolling_machine_uk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3448/4648/files/27919430240.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6668/3292/files/sidinepetelibenidifo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/8162/1664/files/uc_browser_download_apk_for_pc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9735/0554/files/magnet_simulator_script_update_26.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1157/4429/files/60563345536.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_off00005a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A8A 5284 bytes
SHA-256: 87a5901e79ad99772796e7b78c592bad814273768af8ccfc6cf79955e4a41b74
font_01_sfnt_off00006c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C57 14540 bytes
SHA-256: 3018a36ba33cdc8a43830b639dfadcf2ccb1e172dd07429374d1486082ef73ff

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