Malicious PDF — malware analysis report

Static analysis result for SHA-256 090aa245146f492d…

MALICIOUS

PDF

122.2 KB Created: 2020-08-05 08:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bb0424254c756ebd85c2477fbe4c581 SHA-1: ceb77d05909dba6ef08293fb5e1d6b634f941990 SHA-256: 090aa245146f492db4c6fa24ea88c9e687d5b9dd0305476f01fca016399c057c
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a biography link. This indicates a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

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=stanley%20kubrick%20biografia%20pdf
    • http://files.devlindesignstudio.com/uploads/1/3/0/8/130814717/muzezoxofatir-vusuxedoxix.pdf
    • http://files.bvcontracting.com/uploads/1/3/2/6/132683330/regaweruzirozofivodu.pdf
    • http://files.winnebagocountyrta.org/uploads/1/3/1/6/131637419/1852490.pdf
    • http://files.medfieldheightspto.com/uploads/1/3/1/0/131070190/joridesaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2431/7596/files/vasijafawezunup.pdf
    • https://cdn.shopify.com/s/files/1/0431/5404/7137/files/types_of_artificial_intelligence.pdf
    • https://cdn.shopify.com/s/files/1/0434/1720/6946/files/63826432283.pdf
    • https://cdn.shopify.com/s/files/1/0433/5416/1310/files/62291457611.pdf
    • https://cdn.shopify.com/s/files/1/0438/6373/6475/files/seven_deadly_sins_corey_taylor.pdf
    • https://cdn.shopify.com/s/files/1/0447/8458/2813/files/aberturas_de_xadrez_para_leigos_james_eade.pdf
    • https://cdn.shopify.com/s/files/1/0429/5717/6986/files/51367392534.pdf
    • https://cdn.shopify.com/s/files/1/0434/5973/9814/files/keras_vgg16_example.pdf
    • https://cdn.shopify.com/s/files/1/0430/8179/3698/files/tewifadomofijovevuxafo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2197/6220/files/kirufolepetevoredafegevot.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_off00019955.bin
34808b660b2a516ff95979e6955b7237b61ab53825652737ac33d118c7d38d95
pdf-font-stream PDF embedded font (sfnt) at offset 0x19955 5552 bytes
font_01_sfnt_off0001ac4c.bin
6092b591955f31cb642bb53edbc8d602634a1a2150cce095b6c3903be153fada
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC4C 15296 bytes