Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d2724d1d33bf75e…

MALICIOUS

PDF

50.7 KB Created: 2020-11-02 19:42:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: cf648d729cc1b342d08b82353bf25d0b SHA-1: 16627b8929e39a71b637a7e0b6796d78ec36ea35 SHA-256: 1d2724d1d33bf75e338edeb2dfc86572dad0a655a2ab9ea4702f1c760d66cad1
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one pointing to a known malicious redirector. The ML classifier also flagged the PDF as malicious. The document body, though heavily obfuscated, contains a URL that matches the one identified by the heuristics, suggesting an attempt to redirect the user to a malicious site. The presence of numerous PDF links further indicates a link farm or redirection strategy.

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/aws?keyword=statics+study+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5f9ad535730cf.pdfIn PDF document text
    • https://mizijuwewis.weebly.com/uploads/1/3/4/3/134392366/f4f6cb21195085.pdfIn PDF document text
    • https://vimadefivikimaw.weebly.com/uploads/1/3/4/2/134265378/wovewijojuzuk.pdfIn PDF document text
    • https://mexugagerow.weebly.com/uploads/1/3/4/4/134482965/5117705.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/8852288.pdfIn PDF document text
    • https://niramividaro.weebly.com/uploads/1/3/4/5/134517418/9034801.pdfIn PDF document text
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/zimogugenodop-vuzej-refelowike-soxezunifi.pdfIn PDF document text
    • https://vunatoja.weebly.com/uploads/1/3/0/7/130738644/lokuwo_kenot_gerefajoruv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378827/normal_5f9582a1ea14d.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://s3.amazonaws.com/vuliwisuwig/nine_tails_chakra_mode.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/danamumaruvazemusa.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/watch_repair_manual_download.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/vgsales_direct_reddit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3179/7149/files/63582836073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e343764-c42f-468e-bffc-9e77eff2ed23/32407195044.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/46431076031.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_off00007b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B02 4848 bytes
SHA-256: 4a6826cd69ecb3f59e5871f2907645967da6e718a5f9536afe216bed4c953537
font_01_sfnt_off00008b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B7B 10460 bytes
SHA-256: d14e571c98ec1349652fc22c914c85aab8186193025aa8acaef4f63b3df7698e
font_02_sfnt_off0000af50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF50 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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