Malicious PDF — malware analysis report

Static analysis result for SHA-256 344c13235193f145…

MALICIOUS

PDF

42.2 KB Created: 2020-10-07 04:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e3c9f0c98d1f85e96fcb215f4e9db1b9 SHA-1: 7dac2678cd12096f06461cc7260adcf910a04ead SHA-256: 344c13235193f145e65b82b683cd26f2c2e81b56f5d07a257f5225a12528a371
184 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to known malicious redirector infrastructure or disposable hosting. The document body text, though partially corrupted, suggests a lure related to a car sale. The ML classifier strongly indicates maliciousness, and the presence of embedded links points towards a phishing or redirection attack. No scripts were extracted, but the overall structure and link farm behavior are indicative of a malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?keyword=acte+vente+voiture+pdf In PDF document text
    • https://site-1039878.mozfiles.com/files/1039878/xujejizovulogitegeza.pdfIn PDF document text
    • https://site-1039814.mozfiles.com/files/1039814/juzisuzowavale.pdfIn PDF document text
    • https://site-1037010.mozfiles.com/files/1037010/33451152615.pdfIn PDF document text
    • https://site-1038649.mozfiles.com/files/1038649/59506150536.pdfIn PDF document text
    • https://site-1043910.mozfiles.com/files/1043910/kepudagurokizikogiwiso.pdfIn PDF document text
    • https://site-1038387.mozfiles.com/files/1038387/39588387210.pdfIn PDF document text
    • https://site-1038548.mozfiles.com/files/1038548/gemex.pdfIn PDF document text
    • https://site-1040244.mozfiles.com/files/1040244/85127388941.pdfIn PDF document text
    • http://seruk.thetlacademy.shop/uploads/1/3/1/4/131453449/gogadifu-bipusaz-molivumiwamepaj.pdfIn PDF document text
    • http://files.rockthecradlemusic.com/uploads/1/3/0/7/130739116/3288130.pdfIn PDF document text
    • http://nemewif.rabbitresidence.org.uk/uploads/1/3/2/3/132302926/zewot_vuzev_lusubana_bakugimumerowik.pdfIn PDF document text
    • http://files.kskydonner.com/uploads/1/3/1/6/131607131/wedagazumexagexatit.pdfIn PDF document text
    • http://fajogu.psychologisthalifaxns.ca/uploads/1/3/1/1/131164157/juvuvi_rilozuvabidij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6733/7625/files/lithia_springs_park_phone_number.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7762/3201/files/3ds_circle_pad_pro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2606/6851/files/57523578994.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65F1 4780 bytes
SHA-256: e7980015176af2315aba9079e61570b3530a0c5b70fbd07286e187d8c43ad08a
font_01_sfnt_off00007655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7655 11452 bytes
SHA-256: cd89f7f53ac059b03ab792e76c0ccf817e5d19b57fbc384398bbc1b0bf11b521

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