Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ba5fbda70b3fba…

MALICIOUS

PDF

46.4 KB Created: 2020-08-28 13:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d21e356c3a09a97bfd43d608f064af47 SHA-1: b5ba14802326348b4e21e3f2c30c21038839ee65 SHA-256: c9ba5fbda70b3fba8294ca5ca47cf5c8d4d0d0359d30455014b3443b10ed9506
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is used to obscure the final destination. The document body, though heavily obfuscated, contains text related to music and PDF, likely serving as a lure.

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.com/pify?keyword=what+to+listen+for+in+music+pdf
    • http://files.reelanimaltalent.com/uploads/1/3/1/8/131872087/bosofajobos.pdf
    • http://wekanewi.historylessonsforthemoderninvestor.com/uploads/1/3/1/3/131379061/2121207.pdf
    • http://jusom.roguevalleymontessori.com/uploads/1/3/0/8/130813528/tasuvowanemolunurano.pdf
    • http://files.keonilearning.com/uploads/1/3/1/6/131637635/bad20.pdf
    • https://cdn.shopify.com/s/files/1/0432/6670/3516/files/rogazemuxupeta.pdf
    • https://cdn.shopify.com/s/files/1/0437/8938/5888/files/23333621991.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9341/files/48059611113.pdf
    • https://cdn.shopify.com/s/files/1/0428/0818/0895/files/xobaguvekojalutusumi.pdf
    • https://cdn.shopify.com/s/files/1/0438/4754/9088/files/pdf_watermark_app_mac.pdf
    • https://cdn.shopify.com/s/files/1/0457/7692/8924/files/73209770769.pdf
    • https://cdn.shopify.com/s/files/1/0440/6794/6648/files/canon_eos_rebel_t5i_manual_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0432/9180/3801/files/petufunigukifovomunabiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/fuvisatojajifepe.pdf
    • https://cdn.shopify.com/s/files/1/0436/8911/5801/files/kinemazozufatifusanemu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1705/1039/files/gosaravukutekebilarenetu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1296/files/46559235036.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_off0000686c.bin
b6e82290c30c106570c92610c11302c8f61c0a61a484788ad8dbc5184b70da39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x686C 5288 bytes
font_01_sfnt_off00007a3f.bin
3a2e292c48104f956252760305520b3e442d7797a10018c228cd778f37cfb2b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3F 10632 bytes
font_02_sfnt_off00009e42.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E42 4324 bytes

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