Malicious PDF — malware analysis report

Static analysis result for SHA-256 15dfb7fe977a2a0d…

MALICIOUS

PDF

72.4 KB Created: 2020-08-07 07:39:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87f427a21e35c8165eafd7d410b524fa SHA-1: 96121662761f5464ea5640245f829f748144ee7b SHA-256: 15dfb7fe977a2a0dca7a62a58db140dcc09eb8a88e84f255c9b2697d37d305b4
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to 'advance care directive pdf' and includes the malicious URL. The presence of numerous external PDF links further indicates a link farm or redirection strategy.

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=advance+care+directive+pdf
    • http://files.stevecanderson.com/uploads/1/3/1/3/131379183/tusemi.pdf
    • http://files.valleyrootsfoodhub.com/uploads/1/3/0/7/130740344/fa8b50ce.pdf
    • http://files.handmadebylouisa.com/uploads/1/3/0/7/130775827/25f7f89e987e0.pdf
    • http://files.omnipacking.net/uploads/1/3/1/3/131398100/telujuxemaxetide.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2569/4883/files/92216788528.pdf
    • https://cdn.shopify.com/s/files/1/0429/1959/2102/files/lamusegosodisuginemow.pdf
    • https://cdn.shopify.com/s/files/1/0431/0004/5469/files/tuvukozezovurulemuluz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8365/3527/files/60873199508.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1480/files/43033273667.pdf
    • https://cdn.shopify.com/s/files/1/0437/3299/2161/files/judoted.pdf
    • https://cdn.shopify.com/s/files/1/0435/5004/8420/files/13934291608.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/51968624614.pdf
    • https://cdn.shopify.com/s/files/1/0436/5657/7182/files/tapitegor.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_off0000dfe0.bin
9324224ea52d3fb674b68701267d2f2cfe224ef317185ab31bfe03c036e8d382
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE0 4988 bytes
font_01_sfnt_off0000f0f1.bin
cc1d8d1bbba827317f7f5dd6af5faaa9d819bd6a938f1eeece2486912cdf63dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F1 10528 bytes