Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e20817a76f7f28…

MALICIOUS

PDF

42.3 KB Created: 2020-09-18 14:39:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cec849ff75d3b2680168c031d7a45287 SHA-1: 241d8e1280aff4b24182dd69ad146f5b449dd089 SHA-256: 10e20817a76f7f287c58b26e9956ca4394eb2bbb7e757d257076018514a76a4e
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt to lure users to malicious sites. No scripts were extracted, but the primary attack vector appears to be redirection via malicious URLs.

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.link/wix?keyword=net+force+worksheet+pdf
    • http://rerukize.tricotting.com/uploads/1/3/1/0/131070374/gajutiropop_tibepebitamofa_nexam_kakositosizivuw.pdf
    • http://xuraxili.johntroypainter.com/uploads/1/3/0/9/130969746/ffbfef6a24e51b4.pdf
    • http://jitosen.veteranchildren.com/uploads/1/3/0/7/130775209/daxikofa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://54c18b9d-9af4-4326-a928-e9a1e9cf4742.filesusr.com/ugd/6f58fb_2263c1f93d9b4623b5d370d47a543d92.pdf?index=true
    • https://bd2dd126-bc31-4fca-b7d2-61f13150b995.filesusr.com/ugd/1e533a_f2c69c358eff49bcafa34d7173ee4b17.pdf?index=true
    • https://9db926e5-20cd-4f7c-b9e2-2aa0b675fe5d.filesusr.com/ugd/fef373_e4a682d576fb4216a2d029f6b2945faf.pdf?index=true
    • https://e8511737-4e41-47eb-9ce8-e811f3d16e0f.filesusr.com/ugd/ee9d3f_02439493f1dd441c972c83c694c2ae67.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/33156379233.pdf
    • https://cdn.shopify.com/s/files/1/0432/0926/1218/files/tipinunegenuno.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_off000066b9.bin
cb59df30721fa73d6c98b02cafe3bc6bd64a09d3ac2c90f026771da43f836aae
pdf-font-stream PDF embedded font (sfnt) at offset 0x66B9 5124 bytes
font_01_sfnt_off00007849.bin
38fed12a6bae55050eb57cb81507a823244e78b200a0b20460f1e0a5ef280a1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7849 10588 bytes