Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c23e97cf8095032…

MALICIOUS

PDF

36.9 KB Created: 2020-08-23 12:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7a3b443d2f510d8f93fa04e32c0d8b2 SHA-1: aa9c8172fd4d4899f3b1eeff58972c3d0f292b4a SHA-256: 2c23e97cf809503295a718403b4e0b57e3df68d9819b20c058e20cd56fe31c05
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though partially corrupted, contains the URL 'https://ttraff.ru/pify?keyword=aprende+a+leer+con+pipo+pdf', which is likely the initial lure. The presence of numerous other PDF links suggests a link farm or a method to obscure the true destination.

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=aprende+a+leer+con+pipo+pdf
    • http://files.10-yranch.com/uploads/1/3/1/1/131163492/6560581.pdf
    • http://files.upgradedcomputers.com/uploads/1/3/1/0/131070560/03d0d8.pdf
    • http://files.hihco.org/uploads/1/3/0/7/130776481/df646db.pdf
    • https://cdn.shopify.com/s/files/1/0438/3247/5798/files/baarish_yaariyan_full_song_pagalworld.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3971/files/latupolal.pdf
    • https://cdn.shopify.com/s/files/1/0429/7100/5082/files/pagunameb.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34993807018.pdf
    • https://cdn.shopify.com/s/files/1/0464/6364/7912/files/pakos.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2104/files/92980795416.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/94162549896.pdf
    • https://cdn.shopify.com/s/files/1/0452/1954/5245/files/alere_filariasis_test_strip.pdf
    • https://cdn.shopify.com/s/files/1/0427/6515/6508/files/77176961271.pdf
    • https://cdn.shopify.com/s/files/1/0437/2814/2501/files/sscnr_cgl_answer_key.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_off000051d5.bin
569d71e8792ea3a874a7da66e7eca5587bcf55dd8bda3bcd2e54d89991ca7531
pdf-font-stream PDF embedded font (sfnt) at offset 0x51D5 4960 bytes
font_01_sfnt_off000062ba.bin
5bd1fec2990577d843423163bb90b6062c1cd2025f89a03ac2a315ccbb4341c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x62BA 10616 bytes