Malicious PDF — malware analysis report

Static analysis result for SHA-256 7484bc9dbaad9ec1…

MALICIOUS

PDF

44.6 KB Created: 2020-08-18 17:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e61a37969fc5ed5cfcd6836571b855b6 SHA-1: 4572c18e5481793ff12ffdeda91272c9912ddc3f SHA-256: 7484bc9dbaad9ec164079581997e44a08d7706003c762ddf189203b5a53221df
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which are designed to appear as legitimate documents but lead to a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that one of the primary links directs to known malicious infrastructure. The 'PDF_SEO_LINK_FARM' heuristic further suggests a deliberate attempt to create a link farm, likely for SEO manipulation or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

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=heart+breaking+bollywood+songs
    • http://detadu.fastmobileautoservice.com/uploads/1/3/2/7/132710654/dd86241828af.pdf
    • http://bamokud.msjonline.com.au/uploads/1/3/1/6/131607919/lejen_tedegoruko_damezuzegof_jezubim.pdf
    • http://files.inachildsname.com/uploads/1/3/0/7/130740249/1593603.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9943/7721/files/dnd_example_dungeons.pdf
    • https://cdn.shopify.com/s/files/1/0434/0324/7781/files/76693285903.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/25450240097.pdf
    • https://cdn.shopify.com/s/files/1/0436/9245/8139/files/are_we_there_yet_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0433/8286/6072/files/airport_vocabulary_esl.pdf
    • https://cdn.shopify.com/s/files/1/0432/0319/9138/files/blitzer_college_algebra_6th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/7759/9383/files/67052810408.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/zitosajijima.pdf
    • https://cdn.shopify.com/s/files/1/0431/2550/6208/files/bodevoxevejim.pdf
    • https://cdn.shopify.com/s/files/1/0437/4256/0405/files/auriculotherapy_ear.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_off000068ed.bin
5ed70297c2fde83207263839220b323abb0143934da14057fa016ba6edde313e
pdf-font-stream PDF embedded font (sfnt) at offset 0x68ED 5352 bytes
font_01_sfnt_off00007b3e.bin
9b665c76faa12470a92d89021b8eea81085066a61cf4386463e738398872a558
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3E 13532 bytes