Malicious PDF — malware analysis report

Static analysis result for SHA-256 0483f2f47ed3c126…

MALICIOUS

PDF

48.5 KB Created: 2020-08-21 20:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db9b4b5be25e31c91c4908c35d0ca685 SHA-1: 52dc34b78b695aa468a8e5462af4d0b29146ae9d SHA-256: 0483f2f47ed3c1266ff29572c9b7c22ae50df3912767bbc2dd0ad3b065fbf80d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious payload. The document body and embedded links suggest a lure related to educational content, specifically 'busuu french app' and 'multiplying fractions worksheets', to entice users to click the malicious link. The presence of numerous external PDF links further indicates a link farm or redirection scheme.

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=busuu+french+app
    • http://files.nvrg.net/uploads/1/3/1/3/131398099/7b83ad2021.pdf
    • http://files.tatumflynn.net/uploads/1/3/0/7/130775728/6838583.pdf
    • http://files.captredentertainment.com/uploads/1/3/2/7/132740399/fc571314b71947.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/4277/2891/files/multiplying_fractions_worksheets_4th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0429/0635/3823/files/98620245320.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0957/files/mortal_kombat_trilogy_ps1_rom.pdf
    • https://cdn.shopify.com/s/files/1/0431/7695/1965/files/70807493213.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4442/files/52127533406.pdf
    • https://cdn.shopify.com/s/files/1/0432/0080/7070/files/vexuba.pdf
    • https://cdn.shopify.com/s/files/1/0430/3765/5193/files/bigulovarelesepikepoxidi.pdf
    • https://cdn.shopify.com/s/files/1/0435/6915/2163/files/bible_bowl_questions.pdf
    • https://cdn.shopify.com/s/files/1/0432/5844/5979/files/rabuzonu.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005eb2.bin
49176e335c58be22b16aa2ffb55cacd8c6c08653bfeeb81fcb1c84d76adfa36a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB2 3252 bytes
font_01_sfnt_off00006a65.bin
c7d1c68ffd392a68013a26d09481a3a6cdc3c8dbbe140f27b53a50c65d00b4cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A65 5120 bytes
font_02_sfnt_off00007bc3.bin
cd758328cb875bfa13ac69288ef41cd84df12ab4992ef60ba4a712dfef5eb3a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC3 10588 bytes
font_03_sfnt_off0000a005.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA005 16092 bytes

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