Malicious PDF — malware analysis report

Static analysis result for SHA-256 6214b6cf737b6c88…

MALICIOUS

PDF

55.8 KB Created: 2020-08-16 23:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f345b177c8e5d878145bfd9538e27733 SHA-1: d200c33a191b3e3394108f32a02a45e88a7ffd35 SHA-256: 6214b6cf737b6c88ab6d19db6fad19abe4a2aeff1cf9f947b75c7565c11552f7
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation or traffic redirection. One prominent link, 'https://ttraff.ru/pify?keyword=engineering+drawing+text+book+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating a deliberate attempt to direct users to potentially harmful infrastructure under the guise of providing a free textbook.

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=engineering+drawing+text+book+pdf
    • http://files.keyuped.com/uploads/1/3/1/4/131454770/29125.pdf
    • http://files.retrieversanew.com/uploads/1/3/1/3/131397971/dixevito.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0428/0107/0247/files/81200662295.pdf
    • https://cdn.shopify.com/s/files/1/0454/7385/7686/files/gixofutopaludafegeduposoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/2613/6743/files/bursary_appeal_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0428/0126/6851/files/16869460312.pdf
    • https://cdn.shopify.com/s/files/1/0440/3183/6310/files/dirty_sprite_2_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0435/7036/4571/files/vivid_fallout_4.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/jack_in_the_box_cash_register_training.pdf
    • https://cdn.shopify.com/s/files/1/0434/6350/8121/files/xupopulalenoborobuba.pdf
    • https://cdn.shopify.com/s/files/1/0435/9657/8975/files/listado_de_paises_y_capitales_del_mundo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5536/6822/files/1975_oldsmobile_cutlass.pdf
    • https://cdn.shopify.com/s/files/1/0431/1187/4716/files/chevrolet_beat_2020_ficha_tecnica.pdf
    • https://cdn.shopify.com/s/files/1/0440/7050/2565/files/zufikidalezapu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1974/7999/files/tolosokuzuzaxiximefaxogo.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060ed.bin
ea980184f4a6a4edc2273c6edb6d92f26bd35e3f2b9f828476e9fcf71f223df0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60ED 5108 bytes
font_01_sfnt_off00007262.bin
d97e055e11de589539a249dfdf9c15aca1e9caf4700104d1763a3a5d87d8f7f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7262 2320 bytes
font_02_sfnt_off00007cb4.bin
5693e07aab99b64ac13a1d28bd31cdab2c8ec76e522d632270411b8f30fa58d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB4 10084 bytes
font_03_sfnt_off00009f80.bin
207faf14306426b668b87aba0c9d447b8ba40b67f0f7b18660ffa0d3c8132265		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F80 16224 bytes
font_04_sfnt_off0000b4cc.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CC 4324 bytes
font_05_sfnt_off0000c2ce.bin
d2afed849a30ba6045977a85c0a4ded6777ff10e31c18f81e1af6ead543879ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CE 3632 bytes

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