Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fe0a2a8f9e84e3…

MALICIOUS

PDF

42.7 KB Created: 2020-08-23 01:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d69275384707298a642fad478903211d SHA-1: 173e881a8d597beb98946d0cc23aba75e2a5ad33 SHA-256: 73fe0a2a8f9e84e37efceb8d516f42b13772792027cb372af40e1a75d9fda548
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to a redirector service designed to obscure the final destination. The primary redirector URL is associated with known malicious infrastructure, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, contains text related to 'Undertale piano sheet music letters' and the malicious URL, indicating a lure to drive traffic to malicious sites.

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=undertale+piano+sheet+music+letters
    • http://files.newtongeorgiadems.org/uploads/1/3/1/3/131397960/zizebadipi_wuwatonevapo_julemufevosizi_tijumina.pdf
    • http://files.johannes-keller.net/uploads/1/3/0/8/130813042/pojemijagemonivu.pdf
    • http://files.motiondesignsmb.com/uploads/1/3/0/7/130738714/b94fb59f1971b12.pdf
    • http://files.lifetrendgroup.com/uploads/1/3/1/4/131437724/ef8be446.pdf
    • http://files.nightheronfarm.com/uploads/1/3/0/8/130814861/gofamoviraze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0462/8466/9088/files/mewuzilowopem.pdf
    • https://cdn.shopify.com/s/files/1/0429/0638/6595/files/d._o._c_maroc.pdf
    • https://cdn.shopify.com/s/files/1/0437/3803/8423/files/sixezikigarajeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/7492/0347/files/40932409105.pdf
    • https://cdn.shopify.com/s/files/1/0428/4959/9651/files/498268715.pdf
    • https://cdn.shopify.com/s/files/1/0429/8375/1831/files/kajolinagam.pdf
    • https://cdn.shopify.com/s/files/1/0428/4314/4355/files/36513748041.pdf
    • https://cdn.shopify.com/s/files/1/0450/2405/1358/files/program_coordinator_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0438/4676/2656/files/rupifulusi.pdf
    • https://cdn.shopify.com/s/files/1/0427/9002/7430/files/wuwofagipuwowubix.pdf
    • https://cdn.shopify.com/s/files/1/0427/3173/3159/files/gisadaravipelaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/mubivaxivajukamapawop.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_off00006221.bin
f604770e5f1e59506ef382490c9b8d3ef5f1789ad6d7ccf2894b2fcde6f0b318		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6221 5304 bytes
font_01_sfnt_off000073f6.bin
fee014ce719a7c92b7116844f9fa0002202bd8f8b60a0338f0514520dfd3a9d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73F6 13428 bytes

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