Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e22d4834425c3d…

MALICIOUS

PDF

44.9 KB Created: 2020-08-15 03:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 217993054bec3db2c9385bfa559f9ad4 SHA-1: 3a32aaf961e5c9bffd9ed3bbb1be7c7186c8750b SHA-256: a7e22d4834425c3d42273f36c4e87ac7c586c8f7789d40618ff59c26c7a4b54d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=babies+video+status'. Additionally, it features a large number of external PDF links, many of which are hosted on potentially compromised or malicious domains. The ML classifier also strongly indicated maliciousness. The document body contains the malicious URL, suggesting a lure to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=babies+video+status
    • http://sisexe.harrisvillegolfcourse.com/uploads/1/3/2/8/132816066/3411261.pdf
    • http://dujozari.restoringwellness.org/uploads/1/3/0/8/130814328/kuneruf.pdf
    • http://files.lscf.ca/uploads/1/3/1/1/131164568/kosekesanupowog.pdf
    • http://lupusuj.boonecreekfarms.com/uploads/1/3/0/7/130775219/vajadaruda.pdf
    • https://cdn.shopify.com/s/files/1/0431/5385/0524/files/nidujijetigezilavetumamag.pdf
    • https://cdn.shopify.com/s/files/1/0429/5373/6348/files/99696574193.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2335/files/definition_of_training_program.pdf
    • https://cdn.shopify.com/s/files/1/0435/8111/2483/files/california_driver_s_license_renewal.pdf
    • https://cdn.shopify.com/s/files/1/0429/3630/3782/files/87756388619.pdf
    • https://cdn.shopify.com/s/files/1/0431/2740/6746/files/third_conditional_explanation_and_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0435/1882/0511/files/luzamev.pdf
    • https://cdn.shopify.com/s/files/1/0436/5660/9957/files/merits_and_demerits_of_parliamentary_form_of_government.pdf
    • https://cdn.shopify.com/s/files/1/0439/0204/2280/files/makojezitet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vaxopegi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1637/files/kuzuduga.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/

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000042cf.bin
b28c453a544bad2f0aa49c7332b878e91c94c05ea30dbb66042dbb2a1cf44c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x42CF 4716 bytes
font_01_sfnt_off000052d9.bin
b4977757c8e8a3a458fa37b431f37059aa6704ff7e8bf4202e1f57c18f7d2029		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52D9 3316 bytes
font_02_sfnt_off00005f75.bin
cc55a4039b1b248c0e84a081d79d4ec7af5db5edc0e17f009a266347d02ef24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F75 9448 bytes
font_03_sfnt_off00007fdf.bin
55608ce8de1da5509139ad732d6996c70d7d80b11cf4935fb77780a66e8b1a3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FDF 16660 bytes
font_04_sfnt_off00009614.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9614 4324 bytes

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