Malicious PDF — malware analysis report

Static analysis result for SHA-256 a727b8ab6479ee59…

MALICIOUS

PDF

45.9 KB Created: 2020-09-16 21:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0e5eace4ea0a75524ce0469218051b9 SHA-1: a237a77b0b2d02cc90a6f2140b9db6812101092c SHA-256: a727b8ab6479ee5936a46001b10f96273ce64efd10479c9dc88253e2991cce3f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded links, many of which point to external PDF files, forming a link farm. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, though obfuscated, contains a URL that appears to be part of this malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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.club/wix?keyword=kettering+high+school+abandoned
    • http://gupados.ironriverbiblechurch.org/uploads/1/3/1/3/131383483/jokuwelujozunofexu.pdf
    • http://files.imperialgrp.com/uploads/1/3/1/4/131453982/jarukugupogawiwop.pdf
    • http://kawano.bourlandestates.com/uploads/1/3/1/3/131398232/sukapigiku.pdf
    • http://vujuvasop.hannahjudson.com/uploads/1/3/0/7/130739204/xipuz-begesikavojiz-bowuzivo-wofilut.pdf
    • http://tewexob.stuartcrouch.net/uploads/1/3/0/7/130775451/xupukilivuj_sidarepusofigi.pdf
    • http://files.traditionalmagic.com/uploads/1/3/2/3/132303374/wopug.pdf
    • http://jetat.pursesbyleanne.com/uploads/1/3/1/6/131606346/menawazexita_fapulir_sujemipe_sepugidije.pdf
    • http://xireg.thecruisedirector.net/uploads/1/3/1/4/131456320/d9deb33.pdf
    • http://files.wolfisle.com.au/uploads/1/3/0/9/130969083/4579419.pdf
    • https://cdn.shopify.com/s/files/1/0462/4079/2727/files/verelelumubirabujaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/4890/2557/files/atomic_structure_test_review.pdf
    • https://cdn.shopify.com/s/files/1/0430/1661/8145/files/26066845402.pdf
    • https://cdn.shopify.com/s/files/1/0463/9408/1435/files/legend_of_grimrock_2_portraits.pdf
    • https://cdn.shopify.com/s/files/1/0437/8447/0690/files/dazagizoxasezosibimabus.pdf
    • https://cdn.shopify.com/s/files/1/0431/0600/9242/files/gubutetazokirorile.pdf
    • https://cdn.shopify.com/s/files/1/0457/6591/8884/files/63705273307.pdf
    • https://cdn.shopify.com/s/files/1/0433/7798/3651/files/57902939123.pdf
    • https://cdn.shopify.com/s/files/1/0440/4042/1541/files/keto_diet_file.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_off00007559.bin
329a7fc4aa55f10b779bfeb441201697ab7e43e546f17b4f108aed75042d64a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7559 5308 bytes
font_01_sfnt_off00008769.bin
ed7100e5f41d31051e335fab48410dcfda8b3d94413ca5bac34a8d67d74a375c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8769 10292 bytes

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