Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9a0c6f1623f3c4…

MALICIOUS

PDF

72.3 KB Created: 2020-08-05 15:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 218d0fb26ce41cac78904ace54a722d2 SHA-1: a30d8e5b08550b104c79e6e4b65c2b5b83aa94c6 SHA-256: 5b9a0c6f1623f3c40cc117fa8d22a86db0aad2fe455d184fe6b719b8b82b5276
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to trick users into visiting a malicious site. The ML classifier also strongly indicated maliciousness.

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=caracteristicas+de+la+republica+aristocratica+pdf
    • http://files.cavershamholistics.co.uk/uploads/1/3/2/6/132681951/8863419.pdf
    • http://files.bearcrack808.com/uploads/1/3/1/4/131438161/roguno_puteriremitasez_nototobasu.pdf
    • http://files.flamelilyarts.com/uploads/1/3/0/8/130813834/kumekafabufazi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5789/7882/files/ark_kill_command.pdf
    • https://cdn.shopify.com/s/files/1/0437/4118/4165/files/sam_smith_too_good_at_goodbyes_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/7469/0965/files/75047015646.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3468/files/faleroforag.pdf
    • https://cdn.shopify.com/s/files/1/0433/0848/2710/files/bupowukokujabud.pdf
    • https://cdn.shopify.com/s/files/1/0429/5501/4298/files/dobujen.pdf
    • https://cdn.shopify.com/s/files/1/0436/5592/1822/files/70566621925.pdf
    • https://cdn.shopify.com/s/files/1/0434/0924/4316/files/d_d_incapacitated.pdf
    • https://cdn.shopify.com/s/files/1/0433/9659/5870/files/53892609973.pdf
    • https://cdn.shopify.com/s/files/1/0431/3792/5269/files/kokijamewarusi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9753/9231/files/nuance_editor_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/9843/9837/files/directv_dish_pointing.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2ce.bin
e47567af7b9778a149ccbcc749bf1195dbdf55db9b2542d146561054be949510		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CE 5196 bytes
font_01_sfnt_off0000d477.bin
a739fa8c655b06705c6abcbc2c30b0757f1d6b477c3b4968d05eeb6ef712c213		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD477 11292 bytes
font_02_sfnt_off0000f993.bin
1fcaef87469fe8154f5264d5f5151768477887fc8d3aeea6d879f3801c4bd921		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF993 16840 bytes

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