Malicious PDF — malware analysis report

Static analysis result for SHA-256 f561414659f45256…

MALICIOUS

PDF

48.7 KB Created: 2020-08-10 06:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d24f26e2a20d039924822e3269a9c609 SHA-1: 892115ab5c8739a201c01c2aa4c38c93352ff164 SHA-256: f561414659f4525651759d15cc9bbd630c3d5724c5bdbe82b19732139aef9a20
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=acid+base+and+buffer+solution+pdf', which is a known malicious redirector. This indicates an attempt to redirect users to malicious content, likely for further exploitation or credential harvesting.

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=acid+base+and+buffer+solution+pdf
    • http://ranavug.artprofilms.com/uploads/1/3/1/3/131398020/3374458.pdf
    • http://redoz.robertfountain3.com/uploads/1/3/0/8/130814328/loperuvad_gadetibovaruver.pdf
    • http://ledov.kwpoole.net/uploads/1/3/1/6/131636725/negis_duzelo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5928/1061/files/19473957032.pdf
    • https://cdn.shopify.com/s/files/1/0428/3678/7356/files/32545360741.pdf
    • https://cdn.shopify.com/s/files/1/0439/4293/6731/files/gujinavaxobidizaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/3596/7143/files/72908500754.pdf
    • https://cdn.shopify.com/s/files/1/0428/4959/9644/files/16983364412.pdf
    • https://cdn.shopify.com/s/files/1/0440/6591/5032/files/lofubidezaboput.pdf
    • https://cdn.shopify.com/s/files/1/0430/3355/9203/files/765742407.pdf
    • https://cdn.shopify.com/s/files/1/0434/8723/2166/files/kumut.pdf
    • https://cdn.shopify.com/s/files/1/0429/1703/6198/files/37229761586.pdf
    • https://cdn.shopify.com/s/files/1/0435/8648/6440/files/95864412657.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b3c.bin
648200f6b3295b9f70727f67640c0e60c248d874312da5110d5d94dcb931eaad
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3C 5276 bytes
font_01_sfnt_off00007d3b.bin
f17420fe38b74ae3b15a8ce03f250fafd8caed79a8dda0b2526cb18905516e95
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D3B 10124 bytes
font_02_sfnt_off0000a007.bin
26f23ec5624e59c14082cf1da1a59f8d536df8d522aae110cb8152a9a1cedf59
pdf-font-stream PDF embedded font (sfnt) at offset 0xA007 16248 bytes