Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2ceb1ffba321ef…

MALICIOUS

PDF

41.4 KB Created: 2020-08-12 15:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4bbef7fe52804190a15833c0fe28704 SHA-1: 2a1a19e38ddc039ff4b9edafe1ee89d250a3968e SHA-256: 5b2ceb1ffba321ef1c6892914a3753e33ab045355699014058f67772e706001c
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 link farm designed to redirect users to malicious sites. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies a link to 'ttraff.cc', a known malicious redirector. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=les+neurones+enchant%25C3%25A9s+pdf
    • http://files.ajhtl.com/uploads/1/3/1/6/131637224/mapoxifubeve.pdf
    • http://soxoxep.penhurstacademy.co.za/uploads/1/3/1/8/131856584/zideputum-wiwixenetuwofi.pdf
    • http://files.juanitashousecleaning.com/uploads/1/3/2/6/132681293/mizajetevit.pdf
    • http://daluvexa.ovtc.net/uploads/1/3/0/9/130969060/bobod-zomamafavaferi-pagemudof-bepisegeke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2574/4547/files/91556870106.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/chemistry_project_on_casein_in_milk.pdf
    • https://cdn.shopify.com/s/files/1/0434/4935/2349/files/vujijemofalu.pdf
    • https://cdn.shopify.com/s/files/1/0447/5843/3943/files/66989624819.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tavolotifejenirogamofiv.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/55193861449.pdf
    • https://cdn.shopify.com/s/files/1/0434/1573/2381/files/access_bars_manual_barras_de_access.pdf
    • https://cdn.shopify.com/s/files/1/0434/5197/3794/files/tv_guide_orlando_fl.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/95979370616.pdf
    • https://cdn.shopify.com/s/files/1/0437/9744/6816/files/78930247525.pdf
    • https://cdn.shopify.com/s/files/1/0431/9815/2866/files/centro_de_masa_gravedad_y_centroide.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_off00005fbf.bin
43d73ae88b1b00a2de9905843c1649565e8fef3f711acded0ec40445337abc5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBF 5292 bytes
font_01_sfnt_off00007175.bin
584694b27a1fcc9d92f6ab0c925bc4a67c826f96c8ae9d00338b2d69495fea47
pdf-font-stream PDF embedded font (sfnt) at offset 0x7175 11812 bytes