Malicious PDF — malware analysis report

Static analysis result for SHA-256 250baa425036e7a1…

MALICIOUS

PDF

41.5 KB Created: 2020-08-21 13:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1aed75ceb05a9c354095509506f724cc SHA-1: 97cbdbd8ceae7ce6071d9c4b50e2ab0eeb064c3f SHA-256: 250baa425036e7a17c10a3a809ae9346f8d1f23ca64bed4132279a4d39336dcb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link disguised as a 'spelling checker free software' lure, which redirects to a known malicious URL (https://ttraff.ru/pify?keyword=spelling+checker+free++software). The document also exhibits characteristics of a link farm, with numerous embedded links pointing to external PDFs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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/pify?keyword=spelling+checker+free++software
    • http://files.exsaltdressings.com/uploads/1/3/1/0/131070113/3675765.pdf
    • http://files.elifebiz.com.my/uploads/1/3/2/6/132695200/sunuvisajuz_katesurefikoju_rusowere_nurovaguwapug.pdf
    • http://dozupid.frombeyondrecords.com/uploads/1/3/1/3/131383377/kifujeju_revifaka_fodavu_mirosajobex.pdf
    • http://files.anitayanwong.com/uploads/1/3/0/8/130873732/wukafeba_konud_vaturiku_zoginezisetor.pdf
    • https://cdn.shopify.com/s/files/1/0435/4726/3131/files/57121318073.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/68523334569.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wixet.pdf
    • https://cdn.shopify.com/s/files/1/0438/3506/4477/files/model_bye_laws_of_cooperative_housing_society_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0445/3515/2804/files/8819419585.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44411244229.pdf
    • https://cdn.shopify.com/s/files/1/0459/9808/0157/files/grievance_handling_register_format.pdf
    • https://cdn.shopify.com/s/files/1/0431/1325/0965/files/doxikoranen.pdf
    • https://cdn.shopify.com/s/files/1/0436/9547/2793/files/wokami.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2122/files/jagimoziralofeweso.pdf
    • https://cdn.shopify.com/s/files/1/0432/7217/5781/files/70145236426.pdf
    • https://cdn.shopify.com/s/files/1/0432/3262/4797/files/desventajas_de_alimentos_transgenicos.pdf
    • https://cdn.shopify.com/s/files/1/0437/7001/9998/files/wordly_wise_book_7_lesson_1_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0429/4678/9542/files/fibawe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://cdn.shopify.com/s/files/1/0432/3262

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006359.bin
72be518e2129005b9aa2a4e8b1e7f56c4de861d8346f82b6c300a8c1378c63c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6359 5536 bytes
font_01_sfnt_off0000763f.bin
e5cd4634df75206ed9e6a060663d25461d0977754304fa28640a266ed544b2b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x763F 10188 bytes

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