Malicious PDF — malware analysis report

Static analysis result for SHA-256 12fb9f42d5837fcd…

MALICIOUS

PDF

44.1 KB Created: 2020-07-31 02:39:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48330ef2ed067a36aa888424a6b98d22 SHA-1: e0c49411b98b6daaaa0aab5a34f658422e5a4a35 SHA-256: 12fb9f42d5837fcd2367bb6f73ab4897e792ba705050d8bbc8fc11ba42bfc2ea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to direct users to potentially harmful websites, likely for phishing or malware distribution.

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.com/pify?keyword=aligner+orthodontics+book+pdf
    • http://files.top-tungsten.com/uploads/1/3/2/6/132680813/soruvozor.pdf
    • http://files.vintageindustriesinc.com/uploads/1/3/2/6/132695663/kabobutidetos.pdf
    • http://files.reikinaturalhealingus.com/uploads/1/3/1/3/131381078/nunesiludezejani.pdf
    • http://files.annamhenderson.com/uploads/1/3/0/7/130739146/gekejinatafotuw-tosafi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3915/2536/files/25004588296.pdf
    • https://cdn.shopify.com/s/files/1/0433/3525/4171/files/kavenunenejarepe.pdf
    • https://cdn.shopify.com/s/files/1/0435/8130/9085/files/gewubavepepuvenaxipexuzux.pdf
    • https://cdn.shopify.com/s/files/1/0436/9973/2633/files/58685054109.pdf
    • https://cdn.shopify.com/s/files/1/0428/7135/7596/files/85350930050.pdf
    • https://cdn.shopify.com/s/files/1/0431/7832/8224/files/56763828182.pdf
    • https://cdn.shopify.com/s/files/1/0432/4353/6552/files/lapusixebubogoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/katapazepuf.pdf
    • https://cdn.shopify.com/s/files/1/0429/3401/0015/files/vupevavofozuwizenew.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/64993114425.pdf
    • https://cdn.shopify.com/s/files/1/0432/6401/6539/files/44190317848.pdf
    • https://cdn.shopify.com/s/files/1/0431/0011/0999/files/dodis.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_off00006d4a.bin
9ad27536f7269568321821bbde3655ae4283ad0f52f72990b09b184f2b2f0912
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D4A 5188 bytes
font_01_sfnt_off00007edf.bin
bd8f38b0c8f25d2a284a2c929522146729bfd1e16c4e14eb539e61e3eefef2b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EDF 10728 bytes