Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9bec4bb72bc1df…

MALICIOUS

PDF

46.3 KB Created: 2020-08-09 07:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10bac99162e2ac3f02a3e002ea911468 SHA-1: 3cfaef76fe9d538a47db5e15b25e7560cc322071 SHA-256: 5b9bec4bb72bc1dfbb3ae37d42d59e1b45f5393c53243b5fa38073c2464a60eb
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious sites, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The primary malicious URL identified is https://ttraff.com/pify?keyword=cours+de+l+anatomie+humaine+pdf, which is a known redirector. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to lead the user to a malicious payload or phishing page.

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=cours+de+l+anatomie+humaine+pdf
    • http://files.copperchiefstore.com/uploads/1/3/2/6/132682802/lanesiwanuza.pdf
    • http://gilovogi.pdsummit.ca/uploads/1/3/0/8/130814328/zusovagoxomumof.pdf
    • http://files.entotofoundation.org/uploads/1/3/1/4/131454986/c99c7462.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/4235/4853/files/74240023501.pdf
    • https://cdn.shopify.com/s/files/1/0428/6083/9078/files/length_converter.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2255/files/xumogudelatonizo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3860/5461/files/onn_portable_charger.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/jutoxeripavejabomavam.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/49385048896.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16481260084.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tifomev.pdf
    • https://cdn.shopify.com/s/files/1/0435/6151/7217/files/15067208951.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12339474235.pdf
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/44475791700.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_off00007320.bin
58e0ca14a0ac524c6dc109b0a8c65dca0d74afd3b6482d9cb59b331b821f411b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7320 5188 bytes
font_01_sfnt_off00008494.bin
f73a60bb1061eaa5b305020fab5a521f07c5528b98c76be87c24bca7382370e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x8494 12176 bytes