Malicious PDF — malware analysis report

Static analysis result for SHA-256 04303f5f4ba5f6ba…

MALICIOUS

PDF

35.5 KB Created: 2020-09-01 04:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9d34cb74a8db4b280be3d3da1add481 SHA-1: 3c1fbaf997be553f43875374bf9aff3b1ed862fa SHA-256: 04303f5f4ba5f6ba71bdd15600affb4bba5e2f83c7e325c23adbf6b97b824e54
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, includes the same URL, suggesting an attempt to trick users into visiting malicious content. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=quick+witty+answer+crossword+clue
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8631/5682/files/cracks_full_movie_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/division_del_abdomen_en_9_cuadrantes.pdf
    • https://cdn.shopify.com/s/files/1/0430/8615/1833/files/ralifite.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3024/files/59413906310.pdf
    • https://cdn.shopify.com/s/files/1/0434/1222/6202/files/49472574459.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_54620794c6f745f695d0055cb8c5610e.pdf
    • https://static.usrfiles.com/ugd/ab0441_d1faeb980701421495a7340ed5c754cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe4db59a38d34125ab614f0278647cb5.pdf
    • https://static.usrfiles.com/ugd/2e16aa_04a0c194410741a79d5dbbce02406ab7.pdf
    • https://static.usrfiles.com/ugd/086daf_407c141d5a6b4fadb2038baf60ac8364.pdf
    • https://static.usrfiles.com/ugd/ade4e6_b314f14820f84148975181201cd3ab67.pdf
    • https://static.usrfiles.com/ugd/d4579c_96a522a6b27840c4b032bebf0215347f.pdf
    • https://static.usrfiles.com/ugd/ca300b_c19b55ae12c44669bf08f56c08aaa412.pdf
    • https://static.usrfiles.com/ugd/1b8612_bc74e9f0c2644673b78b4e2f7501156e.pdf
    • https://static.usrfiles.com/ugd/ca9b0a_37b11f3f99bc437baaecd980b6f56ed6.pdf
    • https://static.usrfiles.com/ugd/03ae60_703716c6ab4e4c98b97c32a18f100f3e.pdf
    • https://static.usrfiles.com/ugd/7c30af_a4e44c356cc146ea9cea1010e96c55b0.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_off00004c33.bin
b0cf8866b6fc4e5435b9244a7442c904a0c86cc36cb4556cb73e246e51eaa53a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C33 5252 bytes
font_01_sfnt_off00005e3d.bin
fd1bf04b7d2729435f5bd7740b89731f2ea94660358b82190e5f9b31550d485e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3D 10288 bytes

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