Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eb32ec3a63e31e4…

MALICIOUS

PDF

58.3 KB Created: 2020-08-12 14:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ec4a731c6767a9969f5926598c0d637 SHA-1: 44fa36356307185924211253f05029bc1b564ac0 SHA-256: 1eb32ec3a63e31e4debb6a8db69a8f9238effdedcafb60f214507ad7259e8b33
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the URL which is presented as a physiotherapy assessment form. This suggests a social engineering lure to drive traffic to malicious infrastructure.

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=musculoskeletal+physiotherapy+assessment+form+pdf
    • http://files.brownsvillese92.com/uploads/1/3/1/4/131453060/5740785.pdf
    • http://files.ianrideout.co.uk/uploads/1/3/2/6/132682806/wesatigagedokeziv.pdf
    • http://xikesad.loganfirst.org/uploads/1/3/0/9/130968973/gukadari.pdf
    • http://files.thewanderers.org.au/uploads/1/3/1/6/131607331/5a692599d.pdf
    • http://dudavaze.tcfallnationals.com/uploads/1/3/2/3/132302780/finakulekipana.pdf
    • https://cdn.shopify.com/s/files/1/0431/8425/9231/files/astrophysics_books_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/0144/4514/files/76682346599.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/likizokago.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44240048578.pdf
    • https://cdn.shopify.com/s/files/1/0431/4942/6839/files/juriwopa.pdf
    • https://cdn.shopify.com/s/files/1/0434/7461/6472/files/55878408583.pdf
    • https://cdn.shopify.com/s/files/1/0438/4011/0754/files/d_d_dungeon_master_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/6766/9654/files/43554758209.pdf
    • https://cdn.shopify.com/s/files/1/0429/0641/9367/files/wifujigaponat.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/31177992987.pdf
    • https://cdn.shopify.com/s/files/1/0434/0505/0021/files/78846408699.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mojarugalemidim.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000985f.bin
74505d3e1d8a06b4a2d68086a7a1201f579cf8ea19bc9ebf1168ca9a4a4a7e84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x985F 5448 bytes
font_01_sfnt_off0000aaca.bin
2ab97c19152b3004610718891e77f2a6e37d1a23566d21e7516aa7e66c97a128		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAACA 10120 bytes
font_02_sfnt_off0000cd4a.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4A 4324 bytes

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