Malicious PDF — malware analysis report

Static analysis result for SHA-256 6903843629d75b0f…

MALICIOUS

PDF

36.7 KB Created: 2020-08-06 13:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23112f889a2cb31574f657480148832d SHA-1: 1bf714283e4cb38e6cc28e0dfa11ddc08cbb4bb6 SHA-256: 6903843629d75b0f7f6091bd9d22d2e6671b96e42d0c187eb480daddc9b5f90b
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically disguised as a "technical drawing textbook pdf". The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms that the primary link leads to known malicious redirector infrastructure. The PDF_SEO_LINK_FARM heuristic indicates a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. No scripts were extracted, but the presence of malicious links is sufficient to classify the attack pattern.

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=technical+drawing+textbook+pdf
    • http://files.flyhighlittlebunny.shop/uploads/1/3/1/3/131379443/4552009.pdf
    • http://files.eljewelrydesign.com/uploads/1/3/0/7/130775942/d047c10ef2eb607.pdf
    • http://files.usedlicense.net/uploads/1/3/1/4/131454172/kuwugisutel_bosawirexuxobod_mupizi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/sopebekorevowakabelutavi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5838/8383/files/muzitovizipopo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6254/1982/files/36173141357.pdf
    • https://cdn.shopify.com/s/files/1/0428/4920/6439/files/97924172302.pdf
    • https://cdn.shopify.com/s/files/1/0430/4027/6642/files/fitgirlsguide_28_day_jumpstart.pdf
    • https://cdn.shopify.com/s/files/1/0438/3395/0358/files/97232911589.pdf
    • https://cdn.shopify.com/s/files/1/0431/5486/6333/files/41712064651.pdf
    • https://cdn.shopify.com/s/files/1/0427/9438/5575/files/dnd_3._5_books.pdf
    • https://cdn.shopify.com/s/files/1/0431/2036/1629/files/mupukebekeboweruriduxi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1678/0956/files/pdf_reduce_file_size_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/4742/9031/files/colleen_hoover_slammed.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_off00004f77.bin
c69416ccc647c31b1827fe76e87fdef6d3fe72436119fc3f301d61deffc29b07
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F77 5552 bytes
font_01_sfnt_off0000626b.bin
a9f8dad3b7451ab77af770ccfbbc53c77bca45529d7b865989a1cebb24b05fb2
pdf-font-stream PDF embedded font (sfnt) at offset 0x626B 10440 bytes