Malicious PDF — malware analysis report

Static analysis result for SHA-256 817b39c83baf5745…

MALICIOUS

PDF

37.2 KB Created: 2020-08-08 08:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25900eb75382acc954749f888a8af70d SHA-1: e85878381db86aa2ecdb17e889c5b2b37e3ebfd5 SHA-256: 817b39c83baf57454825d44fbf36f283818b7393c3311a7d6dbccdee00ce25b0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to what appears to be a link farm designed for SEO manipulation. One prominent link, 'https://ttraff.ru/pify?keyword=lala+ramswaroop+ramnarayan+calendar+2020+pdf+free+download', is flagged as malicious. The document body, though heavily obfuscated, contains this same URL, suggesting the primary purpose is to redirect users to malicious infrastructure. The presence of many PDF links and a malicious redirector indicates a likely attempt to distribute further malware or engage in phishing.

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=lala+ramswaroop+ramnarayan+calendar+2020+pdf+free+download
    • http://files.hchstheatre.com/uploads/1/3/1/0/131070733/tavajenuzedu-pozerulaw-ginogixadeve.pdf
    • http://xarinefaj.westernfamilyfarm.com/uploads/1/3/1/4/131453494/xezenazevob-wipofivajiliv-filujozubutaz.pdf
    • http://files.uclachatpd.org/uploads/1/3/1/8/131857626/xibaperixo-rurokajezoxis-ronuj-watogerolov.pdf
    • http://files.royalenfieldmotorcycles.net/uploads/1/3/1/6/131636651/bevatewuviwore-zufegemo-zexipavef-sanixuz.pdf
    • http://files.sctecentralfl.org/uploads/1/3/0/8/130874023/latememekeze_kimixipopo_xufuxiguwuziji_gafelis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/zuzududunosukovunuvebuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/3991/5175/files/97666732110.pdf
    • https://cdn.shopify.com/s/files/1/0433/9495/7475/files/germes_anarobies.pdf
    • https://cdn.shopify.com/s/files/1/0429/9961/1555/files/32270538187.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9444/files/19308010861.pdf
    • https://cdn.shopify.com/s/files/1/0431/7868/8674/files/lopogulolerisokojesorip.pdf
    • https://cdn.shopify.com/s/files/1/0432/9183/6566/files/74545078483.pdf
    • https://cdn.shopify.com/s/files/1/0432/6742/4412/files/jisasamovovozemunilu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6377/1293/files/physics_important_formulas_for_neet_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/6939/1527/files/dynamics_of_machinery_class_notes.pdf
    • https://cdn.shopify.com/s/files/1/0439/1475/6251/files/graphics_design_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/donam.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005230.bin
aaaabec9bcbe3bea611da1a1646285503ad7438f8b696f220930795a90cf03f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5230 5708 bytes
font_01_sfnt_off000065a5.bin
3ab6714343d7601b0d3cf7cf744168bacc6a8b585b7696cea399546a042d771d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A5 9876 bytes

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