Malicious PDF — malware analysis report

Static analysis result for SHA-256 78965b8c05073cb1…

MALICIOUS

PDF

42.0 KB Created: 2020-08-14 03:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c7a548ce4aafce328d38b73914830d7 SHA-1: 17ff44aba89342e3da6680c0b005dfbb8485fead SHA-256: 78965b8c05073cb1927148067211fdd4ff0f7640f03db794b36734c8b9e48284
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, including one that redirects to malicious infrastructure at `https://ttraff.ru/wb?keyword=free%20keto%20cookbook%20pdf`. The document body and heuristics indicate a lure for a 'free keto cookbook' to entice users to click the malicious link. The presence of numerous external links suggests a link farm or SEO manipulation tactic.

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/wb?keyword=free%20keto%20cookbook%20pdf
    • http://files.wakefieldmiddleschoolpta.org/uploads/1/3/0/9/130969206/simalitixirixovogona.pdf
    • http://files.datumfoundation.org.uk/uploads/1/3/1/4/131454304/968664.pdf
    • http://files.steelcityselfdefense.com/uploads/1/3/0/9/130969301/769263.pdf
    • http://subixul.poboyswheelsource.com/uploads/1/3/0/7/130739553/mafuzu-tiduwudivefuw.pdf
    • http://files.catrinastiller.com/uploads/1/3/1/8/131856519/6f2857ca6e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/5503/7093/files/45188180817.pdf
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/39074744561.pdf
    • https://cdn.shopify.com/s/files/1/0443/1613/1484/files/carprofeno_en_perros.pdf
    • https://cdn.shopify.com/s/files/1/0434/0203/5354/files/nolojuwamuxaxedudusisim.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5138/files/75780854643.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25781613666.pdf
    • https://cdn.shopify.com/s/files/1/0436/9226/1529/files/what_is_a_smart_action_plan_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17844710077.pdf
    • https://cdn.shopify.com/s/files/1/0428/5743/1196/files/vasogozuba.pdf
    • https://cdn.shopify.com/s/files/1/0429/8326/0314/files/assistive_listening_devices.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_off0000654a.bin
a512720a4b4b2777a3bb8b767cefe89423cd1f3b5b23cedb15167d0f4ec95529
pdf-font-stream PDF embedded font (sfnt) at offset 0x654A 4888 bytes
font_01_sfnt_off00007603.bin
7aab0c369be28562e26a5dc2386fcf7af6bafd04a92f2a8f09dc52936dfb9094
pdf-font-stream PDF embedded font (sfnt) at offset 0x7603 10908 bytes