Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad51372e65a41df5…

MALICIOUS

PDF

43.7 KB Created: 2020-08-22 20:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07e3528c9b4151be7d68d28caeefdac6 SHA-1: 2015900324732f930e9472f761fefd583e629602 SHA-256: ad51372e65a41df519d091678932448f6af91af90bb242279ca26638025eb5f6
152 Risk Score

Malware Insights

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

The PDF file contains a link farm and a direct link to a known malicious redirector, disguised as an employment letter template. The primary malicious URL is https://ttraff.ru/pify?keyword=introduction+letter+for+employment+template, which likely leads to further malicious content. The presence of numerous other PDF links, many hosted on Shopify, suggests a broad SEO poisoning or link farm strategy to distribute the malicious payload.

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=introduction+letter+for+employment+template
    • http://jesepaj.nannies-pearls.net/uploads/1/3/0/8/130814328/famoruviwefoke.pdf
    • http://jerupepis.miraclepest.com/uploads/1/3/0/7/130738706/ninezadixuvipijinen.pdf
    • http://foxobasu.southfloridapsychology.com/uploads/1/3/2/8/132816202/varerodirapusim-putizifo.pdf
    • http://files.forummigrationandpeace.org/uploads/1/3/2/7/132740595/maxuxunuxigukevetuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2858/files/belajar_bahasa_vietnam.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7312/files/birthday_card_maker_software_free.pdf
    • https://cdn.shopify.com/s/files/1/0451/8959/5287/files/blade_banshee_breeding_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/7678/8117/files/ponuxoxagulufotuxito.pdf
    • https://cdn.shopify.com/s/files/1/0438/2405/4429/files/fafogixubomebu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0106/9220/files/zomubidinazekebog.pdf
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/iptv_stalker_plus.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2459/files/zevedivamematexomipusa.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1480/files/78884645828.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006da6.bin
240069ecf21a1c25501cf2c652640d65fb9f4bf0b9c43182d35b5cc4816706f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA6 5160 bytes
font_01_sfnt_off00007f26.bin
c9f9f3ec6d1ef7c4108bc7965872c4198fe86f53dd64b7c124f4a1f33a0b25fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F26 10136 bytes