Malicious PDF — malware analysis report

Static analysis result for SHA-256 659a2cf43d5339d3…

MALICIOUS

PDF

60.9 KB Created: 2020-08-13 22:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1aac4feedd39814bbeb0019337a095ea SHA-1: befb8726d57b85b48bd183a38acae9d84055a7b0 SHA-256: 659a2cf43d5339d3580c1d970eb9217cf73c2317a0532813d2a2bccba9f44d35
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for free design assets. This suggests the PDF is designed to redirect users to malicious sites, likely for further exploitation or phishing.

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=android+device+mockup+free+psd
    • http://vipef.werkmandental.com/uploads/1/3/1/6/131637814/rarenafawabovof-bodigadiwofovo-beketixifepin-fusifofigiv.pdf
    • http://kagakoto.teiit-bg.com/uploads/1/3/0/7/130775934/991450.pdf
    • http://bugok.anujparashar.net/uploads/1/3/0/9/130969465/vofowixew_budutifejapo_xatiri_kovosuf.pdf
    • http://ganatik.mingateachers.org/uploads/1/3/1/4/131437657/3437961.pdf
    • http://files.camera1.ca/uploads/1/3/1/3/131380413/pizixejawij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1104/7575/files/93096244833.pdf
    • https://cdn.shopify.com/s/files/1/0438/1851/6637/files/california_consumer_privacy_act_of_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/0560/6049/files/que_es_cardiomegalia.pdf
    • https://cdn.shopify.com/s/files/1/0452/9104/5026/files/lawless_and_heymann_sensory_evaluation_of_food.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2383/files/33876680358.pdf
    • https://cdn.shopify.com/s/files/1/0436/0214/9539/files/17155492179.pdf
    • https://cdn.shopify.com/s/files/1/0431/9186/1412/files/najevej.pdf
    • https://cdn.shopify.com/s/files/1/0438/9008/1960/files/cover_letter_for_nursing_job.pdf
    • https://cdn.shopify.com/s/files/1/0440/0742/4158/files/31700065369.pdf
    • https://cdn.shopify.com/s/files/1/0427/5326/1724/files/51208704295.pdf
    • https://cdn.shopify.com/s/files/1/0431/4152/9754/files/23014209898.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_off0000b0f3.bin
099c4906ac045744a30ba0ea4c90a0b5d16dc2e8c32924017106423e6e6631d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F3 5172 bytes
font_01_sfnt_off0000c27f.bin
1307f61bf5086d503b0df260ab2b3afd3a854780b7c9892bea72c1b267b53a6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC27F 10600 bytes

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