Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc53d262ff41b03…

MALICIOUS

PDF

39.2 KB Created: 2020-08-17 11:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccce420fda7ae3fe2ba79a858a4a645c SHA-1: 513c894cee10b5d74ab1e7c48047385e916ee9dc SHA-256: 5fc53d262ff41b0389e3fadf8b84c8fb7bb6c9197985bb15d8ee3b707bbeb8e8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged for containing a large number of external links, many of which point to other PDFs. One of the primary links, 'https://ttraff.ru/pify?keyword=physical+appearance+adjectives+pdf', is identified as a malicious redirector. This suggests the document is part of a link farm or SEO manipulation scheme, potentially leading users to malicious sites or further malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

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=physical+appearance+adjectives+pdf
    • http://jafasulo.livolivo.com/uploads/1/3/2/6/132681268/rapezugekin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6968/6431/files/bella_the_barbarian_barmaid.pdf
    • https://cdn.shopify.com/s/files/1/0429/2067/3433/files/sirirewipebubobazagoliw.pdf
    • https://cdn.shopify.com/s/files/1/0431/8425/9231/files/soleloxodu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0881/0398/files/tesixugitavujifevimepol.pdf
    • https://cdn.shopify.com/s/files/1/0437/0992/3480/files/mozelogokixobubobowod.pdf
    • https://cdn.shopify.com/s/files/1/0434/3998/0710/files/27144154710.pdf
    • https://cdn.shopify.com/s/files/1/0441/2047/3752/files/jinigojutifewu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2441/4882/files/tazenaxeviburewesuwiwe.pdf
    • https://cdn.shopify.com/s/files/1/0436/4340/4441/files/xanoxowiwokodiko.pdf
    • https://cdn.shopify.com/s/files/1/0440/8259/3957/files/buzum.pdf
    • https://cdn.shopify.com/s/files/1/0428/9078/9020/files/38421435441.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b5d.bin
ae4e99c9717946dd3bbe62d796b412101a59ad533cad5e7b3dacf6fee6048dcc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B5D 5484 bytes
font_01_sfnt_off00006e03.bin
d14d560da65333eb0ef8ee294031dd2cd585ce72b4d50ee197c4e8d2a76cc2b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E03 10008 bytes