Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1764228cbec9cea…

MALICIOUS

PDF

40.4 KB Created: 2020-08-30 20:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e323fb932c743ff29244c199628f87f SHA-1: 5546c3f4dff494291c230434d389499309e97cc0 SHA-256: f1764228cbec9cea9a261e3aba58467752db843c49c78d7095c96e487537ff7b
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, appears to contain the same malicious URL and references a PDF title related to 'Sensation and perception wolfe 4th edition pdf', suggesting a lure to download malicious content. The ML classifier strongly flagged this PDF as malicious.

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/wix?keyword=sensation+and+perception+wolfe+4th+edition+pdf
    • https://cdn.shopify.com/s/files/1/0438/9024/5787/files/taraxegafirawenikorom.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2992/files/wudikozazunam.pdf
    • https://cdn.shopify.com/s/files/1/0432/9226/2560/files/pumotak.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/81168299413.pdf
    • https://cdn.shopify.com/s/files/1/0435/8547/0627/files/blades_of_brim_mod_game.pdf
    • https://cdn.shopify.com/s/files/1/0432/2449/8333/files/farm_animals_worksheet_for_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0428/2253/3276/files/zogiluw.pdf
    • https://cdn.shopify.com/s/files/1/0429/1582/3772/files/65923175977.pdf
    • https://cdn.shopify.com/s/files/1/0436/5231/7342/files/byron_burger_menu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4431/6070/files/zalidepumaguxuzo.pdf
    • https://cdn.shopify.com/s/files/1/0463/1756/8157/files/ayushman_bharat_yojana_list_up.pdf
    • https://cdn.shopify.com/s/files/1/0429/8519/3621/files/pioneer_elite_sc-_99.pdf
    • https://cdn.shopify.com/s/files/1/0432/7342/0965/files/82655288918.pdf
    • https://cdn.shopify.com/s/files/1/0435/3556/4949/files/height_of_a_binary_tree.pdf
    • https://cdn.shopify.com/s/files/1/0432/2993/7832/files/gukarebevad.pdf
    • https://cdn.shopify.com/s/files/1/0464/5388/3048/files/annexure_ii_form_for_job_work_format.pdf
    • https://cdn.shopify.com/s/files/1/0464/5784/7976/files/fofajelu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7459/2668/files/takavo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7651/8049/files/information_security_risk_assessment_toolkit.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f41.bin
35f73b17466d0a61b2efad608f984e1f9b27d9582117e3a76d73327cb7885df1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F41 5524 bytes
font_01_sfnt_off00007214.bin
fb0af1c56642f498894b8a91ff3b5a0a01f73e47fef8348ae7c375a6a41be535		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7214 9976 bytes

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