Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f4192046c242e4…

MALICIOUS

PDF

45.7 KB Created: 2020-08-25 19:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef96a0d062efffe2502ea9ff1dc04dfb SHA-1: 9847425ddfd1eddd19082c85ef738b9a03f7d1c5 SHA-256: 13f4192046c242e493478b6054c348390a0034c23826a381a0fcbcf4e01673fd
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to external resources, masquerading as game downloads. The primary redirector URL is identified as malicious infrastructure. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to lead users to malicious content, likely for further exploitation or malware delivery.

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=candyland+pc+game+download
    • http://files.religiousdoodles.com/uploads/1/3/0/8/130815017/3cf85bf08e6b1f8.pdf
    • http://files.two-bridges-flyball.com/uploads/1/3/2/6/132681665/beac4054d.pdf
    • http://zutejuti.theridingtherapycenter.org/uploads/1/3/0/9/130969280/719d00f.pdf
    • http://gozef.aayogaandwellness.com/uploads/1/3/1/4/131454215/f86768f5ace2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0046/2503/files/janosatozup.pdf
    • https://cdn.shopify.com/s/files/1/0463/6835/8555/files/90769172559.pdf
    • https://cdn.shopify.com/s/files/1/0431/3740/0999/files/gurekatoripogexebupewoze.pdf
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/beowulf_old_english.pdf
    • https://cdn.shopify.com/s/files/1/0431/3055/2474/files/what_is_access_control_in_security_guard.pdf
    • https://cdn.shopify.com/s/files/1/0429/9459/8047/files/butixefiderumapifeji.pdf
    • https://cdn.shopify.com/s/files/1/0435/6990/5825/files/atom_python_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/41816671969.pdf
    • https://cdn.shopify.com/s/files/1/0429/6641/7571/files/nuxuboleziwakalaxu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7679/4021/files/dejowuriwusawume.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_off00007285.bin
d6365f4325c7960bed0bf4b379e289e98304a3324398d1b1dc4573761d9edba5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7285 5220 bytes
font_01_sfnt_off0000844d.bin
a90e26de54930f8f45a607071d3c8ddc7a7c7fc693c7a8c791c9e9b0070992f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x844D 11432 bytes