Malicious PDF — malware analysis report

Static analysis result for SHA-256 04f1122c93ee1b61…

MALICIOUS

PDF

69.5 KB Created: 2020-08-09 12:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e655959347e84822047c5f6266d5c34c SHA-1: dcb65c25995f3061c4b41c9b329d3bd4f6af37a4 SHA-256: 04f1122c93ee1b616e657a83c25ec88bc366548bc719edd5d86dad3de2131591
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to potentially malicious or unknown domains, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://ttraff.com/pify?keyword=baltasar+gracian+pdf+el+criticon', is identified as a malicious redirector. 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=baltasar+gracian+pdf+el+criticon
    • http://files.extracoolerart.com/uploads/1/3/0/8/130874474/latafodi-ziwovom-nebuxixibos-kobuxaneruzeza.pdf
    • http://files.mycountyparks.org/uploads/1/3/0/8/130813516/molavudo_kudipuworizu_sojiguxexe.pdf
    • http://fumope.lacinefest.org/uploads/1/3/1/0/131070374/20da0.pdf
    • http://files.rayofaura.com/uploads/1/3/1/8/131856446/fejukanefo_kesotokefet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8116/1121/files/astable_multivibrator_using_ic_741.pdf
    • https://cdn.shopify.com/s/files/1/0428/6477/1238/files/xetale.pdf
    • https://cdn.shopify.com/s/files/1/0432/6191/9396/files/writing_descriptive_text.pdf
    • https://cdn.shopify.com/s/files/1/0444/0922/5382/files/clases_de_sustantivos_ejercicios_resueltos.pdf
    • https://cdn.shopify.com/s/files/1/0446/9984/4762/files/character_traits_worksheet_4th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0447/3726/5813/files/burlesque_definition.pdf
    • https://cdn.shopify.com/s/files/1/0436/4071/7462/files/23172748482.pdf
    • https://cdn.shopify.com/s/files/1/0432/1977/9742/files/20260244304.pdf
    • https://cdn.shopify.com/s/files/1/0439/5253/7758/files/36036173125.pdf
    • https://cdn.shopify.com/s/files/1/0428/0582/1599/files/bagobemunabeloniruranel.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/12262881018.pdf
    • https://cdn.shopify.com/s/files/1/0429/5560/4121/files/xemofefikanulig.pdf
    • https://cdn.shopify.com/s/files/1/0429/5219/6249/files/fazasodivozufef.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_off0000cd1b.bin
af059fa6ee0cd8a7082fb74d6b96280f289fd8a5e7f233bf584c6ea2d100c606		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1B 5372 bytes
font_01_sfnt_off0000df72.bin
ebdd048b7acc612455f8d1ff2be998f519d6d7553f740211a1e36342a6a40c82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF72 12116 bytes

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