Malicious PDF — malware analysis report

Static analysis result for SHA-256 86587c94d773b4b4…

MALICIOUS

PDF

54.2 KB Created: 2020-08-10 02:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 433aa8324168587ad28bba1b27103476 SHA-1: f27c35352583bb21b692a0fac93f51ad139ab971 SHA-256: 86587c94d773b4b40896fbff096118da1f01216ff4eada3fd51317388d6c5e48
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 a redirector service. The primary malicious link identified is https://ttraff.ru/pify?keyword=aruna+asaf+ali+biography+pdf, which is flagged as malicious. This suggests the document is designed to act as a link farm, potentially for SEO manipulation or to redirect users to malicious sites.

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=aruna+asaf+ali+biography+pdf
    • http://files.tamusrt.org/uploads/1/3/1/0/131070469/e7526c6546741.pdf
    • http://files.vq.com/uploads/1/3/1/4/131453399/femesegipo_lozitomi_midavusoxojojaz.pdf
    • http://files.deeperwaterscounseling.org/uploads/1/3/1/3/131379371/8160395.pdf
    • http://files.davidearland.com/uploads/1/3/1/0/131070291/1118535.pdf
    • http://badop.elysharei.com/uploads/1/3/1/4/131482995/vekobo-lamazipenazur-wupufejepoda-fiker.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0433/9158/2357/files/www_audiocastle_net.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/sojajob.pdf
    • https://cdn.shopify.com/s/files/1/0437/7886/7358/files/xawutuxigisas.pdf
    • https://cdn.shopify.com/s/files/1/0447/5063/5162/files/slope_stability_radar.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/vexosa.pdf
    • https://cdn.shopify.com/s/files/1/0431/8226/0384/files/project_topics_in_analytical_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0432/4491/2808/files/11660351551.pdf
    • https://cdn.shopify.com/s/files/1/0439/2566/7995/files/jetblue_mission_statement.pdf
    • https://cdn.shopify.com/s/files/1/0428/0870/5187/files/rekoxuziwonax.pdf
    • https://cdn.shopify.com/s/files/1/0437/4095/4773/files/wow_classic_shiny_red_apple.pdf
    • https://cdn.shopify.com/s/files/1/0439/9484/1246/files/retirement_planning_strategies.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007998.bin
dabcd8fa94a6521eeb989e5b597f0f11bc52273e4c8e9e8ed5137d4c550978dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7998 5532 bytes
font_01_sfnt_off00008c65.bin
78e58316a0f410f4d9c67ac7d278018d5bc0c5c5d7712462d17d0633c0d361dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C65 9960 bytes
font_02_sfnt_off0000aecd.bin
1d20f06c42c8d9c56287906ba8a4e413b5f54c7dc9eea80a9fb8000b460a8caa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAECD 8708 bytes

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