Malicious PDF — malware analysis report

Static analysis result for SHA-256 074fbca179818660…

MALICIOUS

PDF

36.5 KB Created: 2020-08-10 08:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ea3fecc56d0f3498990635b2cde4c79 SHA-1: ef610925f967b0becaa8f93dadd41f2ae10c7855 SHA-256: 074fbca179818660a9b66c5a24522288ff84753215f3fb58a061dc1286ee3329
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 external PDF files, suggesting a link farm or SEO spamming operation. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a malicious intent to redirect users to harmful sites. The document body, though partially corrupted, contains a URL that appears to be part of this redirection scheme.

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.cc/pify?keyword=alejandro+jodorowsky+libros+pdf+gratis
    • http://nulad.thehague2600.com/uploads/1/3/0/8/130873951/siwisipuzepu_nujupezufin_firuvuz.pdf
    • http://files.roswellnorthmusic.com/uploads/1/3/1/8/131856723/fokimu-gubetiwem-fenaxalisep-jixetekof.pdf
    • http://files.txfreedomforce.org/uploads/1/3/1/3/131381046/7448308.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/8786/9592/files/6th_grade_adding_fractions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/7354/4093/files/monografia_de_la_cultura_chachapoyas.pdf
    • https://cdn.shopify.com/s/files/1/0436/8728/0790/files/setifog.pdf
    • https://cdn.shopify.com/s/files/1/0431/7216/7841/files/tuwitisikisupazo.pdf
    • https://cdn.shopify.com/s/files/1/0427/6859/7158/files/4668810139.pdf
    • https://cdn.shopify.com/s/files/1/0437/9541/5189/files/bawikowekebumidipipepet.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7187/files/55473769732.pdf
    • https://cdn.shopify.com/s/files/1/0431/8694/6206/files/76797537614.pdf
    • https://cdn.shopify.com/s/files/1/0431/4952/5156/files/mikotulegulawutaxorexewu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6063/3504/files/19845756523.pdf
    • https://cdn.shopify.com/s/files/1/0434/1235/7270/files/arduino_mega_2560_r3_pin_mapping.pdf
    • https://cdn.shopify.com/s/files/1/0440/4301/0213/files/adapter_design_pattern.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_off00004f41.bin
f7da7d918de8e120427f626a05a8f95f3340b5ee201bc2eba6ef88e8b8cd8d0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F41 5672 bytes
font_01_sfnt_off000062ba.bin
cf44554ebe44d20f8d41e105404077656d5c6c03e5d86cd34a00213204cbf0b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62BA 10076 bytes

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