Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c22f5e63de157f…

MALICIOUS

PDF

84.5 KB Created: 2020-11-08 03:15:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7eee8e7d75cf6a30a7ab8fa8c6e5425d SHA-1: 910a5348d686d7ef077acf19cfc38af560de12f0 SHA-256: c6c22f5e63de157fa2ccef9f860f7fa6abe4ea60728cce54fc2635fb443fdcaa
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a primary link to 'traffking.ru' disguised as an 'appreciative inquiry worksheet'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or SEO abuse tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence suggest malicious intent, likely to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffking.ru/aws?keyword=appreciative+inquiry+worksheet
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/wasepodip.pdf
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/9799733cc743.pdf
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/gupexetegozob_bapedovife.pdf
    • https://tibulewozimok.weebly.com/uploads/1/3/4/0/134017320/2261166.pdf
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5f8ccd8287f70.pdf
    • https://zuwumepegowivos.weebly.com/uploads/1/3/1/0/131069935/2642225.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/febopa/malibu_pilates_chair_reviews.pdf
    • https://s3.amazonaws.com/pajukovuxetu/green_bay_hotels_east_side.pdf
    • https://s3.amazonaws.com/wilugugo/ielts_speaking_task_2.pdf
    • https://s3.amazonaws.com/wibadinavosunom/14166667836.pdf
    • https://s3.amazonaws.com/tejuvonixag/ruguja.pdf
    • https://s3.amazonaws.com/mudurixo/bee_story.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011bad.bin
3fbc90851407af5960fc9998a14e27484dd313a2f252e3fd73f64cdf1eac533b
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11BAD 23788 bytes
font_00_sfnt_off0000e3b2.bin
a9467d506d70de23b3dabdf8bdbe98830570a795737de1693f66a92e7c6ffa31
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 5420 bytes
font_01_sfnt_off0000f63e.bin
6eb4736cd0b1460fc1facba5cd960d4d393acf232dc81be85dd0e2cf24594db5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 10968 bytes