Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9bce488c89d168e…

MALICIOUS

PDF

46.1 KB Created: 2020-08-08 19:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7f8669898e89c7c696fb216e754bd6e SHA-1: 739e31f0e28e360a7635e1d53223ebb46bc87158 SHA-256: d9bce488c89d168e86c66926a1d2674d305dc7c70279cba186a6e47843b261d9
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains the same URL and other URLs pointing to Shopify, suggesting a link farm or SEO poisoning tactic to lure victims. The ML classifier strongly indicates maliciousness, and the presence of numerous external links supports the attack pattern of redirecting users 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.cc/pify?keyword=butterfly+valve+working+principle+pdf
    • http://files.lhequestrian.co.nz/uploads/1/3/2/7/132710497/3fd1c632.pdf
    • http://files.quiltedglo.com/uploads/1/3/0/8/130873718/e16aa4817b.pdf
    • http://fukixaxub.loganwhitmerlegacy.com/uploads/1/3/1/3/131384635/7203601.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5082/files/85529838571.pdf
    • https://cdn.shopify.com/s/files/1/0432/2073/0011/files/nagejalezuwizir.pdf
    • https://cdn.shopify.com/s/files/1/0432/4058/7423/files/sumber_daya_manusia_kesehatan.pdf
    • https://cdn.shopify.com/s/files/1/0433/5802/7928/files/5191135620.pdf
    • https://cdn.shopify.com/s/files/1/0431/9870/9918/files/american_desperado_download_epub.pdf
    • https://cdn.shopify.com/s/files/1/0432/0506/6907/files/kagigoxemukogupaxox.pdf
    • https://cdn.shopify.com/s/files/1/0431/8802/7543/files/968159022.pdf
    • https://cdn.shopify.com/s/files/1/0433/3010/9593/files/vuzisi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9703/8756/files/6989644170.pdf
    • https://cdn.shopify.com/s/files/1/0434/0839/2353/files/mofegebobunizovi.pdf
    • https://cdn.shopify.com/s/files/1/0437/4183/9514/files/social_psychology_aronson_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/1718/2104/files/kewowa.pdf
    • https://cdn.shopify.com/s/files/1/0429/4469/2383/files/gate_electrical_engineering_books_free_download.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_off000067d6.bin
43965635963408bfdbd9fbb793585e4dd515dcfad309e64ff5a23b77258aa427		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67D6 5392 bytes
font_01_sfnt_off00007a5c.bin
56a0edd78db0246682a64c347de86aa1adb671be22d46c0eb92c26dd8e29cd10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5C 10152 bytes
font_02_sfnt_off00009ce4.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CE4 4324 bytes

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