Malicious PDF — malware analysis report

Static analysis result for SHA-256 791b2f20a2e8a727…

MALICIOUS

PDF

37.3 KB Created: 2020-08-23 13:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 139eb566ef9aff674fa3385e2f0a4ac8 SHA-1: c8f8b248e496e282e0587f3cb58cfa8bd7892215 SHA-256: 791b2f20a2e8a7277b32d3671edb19c5b3e8afddb99409ec8d28fe9f97dfc2ee
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=baldi%2527+s+basics+android+version', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text referencing 'Baldi's basics android version', suggesting a lure to trick users into clicking the malicious link. The PDF also hosts a large number of external links, many pointing to Shopify, indicating a link farm for SEO manipulation, likely to improve the ranking of the malicious redirector.

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.ru/pify?keyword=baldi%2527+s+basics+android+version
    • http://files.aspen-industries.com/uploads/1/3/0/7/130739260/85c8107dcccad.pdf
    • https://cdn.shopify.com/s/files/1/0463/4348/7649/files/lotamafolinapawafulu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/vim_for_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0433/7188/8803/files/vuxera.pdf
    • https://cdn.shopify.com/s/files/1/0435/7862/2111/files/aprender_alemo_basico.pdf
    • https://cdn.shopify.com/s/files/1/0437/3417/1800/files/audacity_2._0_5_for_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/7749628993.pdf
    • https://cdn.shopify.com/s/files/1/0429/8250/6647/files/lifokagurasaradogane.pdf
    • https://cdn.shopify.com/s/files/1/0438/7107/6520/files/46163406443.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/31682444307.pdf
    • https://cdn.shopify.com/s/files/1/0447/9533/0717/files/golang_mgo_examples.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005479.bin
dd55f072035ff3bc635f001558e43bad1b3f23931c95f92459cf503a9bd5e6e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5479 5216 bytes
font_01_sfnt_off0000663f.bin
578d4cdebc0b641320397e9ce75cfc5843faad6e8a73db61dd65b56ff7edf5b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x663F 10288 bytes