Malicious PDF — malware analysis report

Static analysis result for SHA-256 107ade1fba380561…

MALICIOUS

PDF

48.6 KB Created: 2020-08-05 15:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df43c629901e94d0be854f65536c6240 SHA-1: f3c0f0393ff58df4303bdd056736d48869ee5e15 SHA-256: 107ade1fba3805614a81166b5434a34757ab0a93ee90a7c0e4926325a478f780
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a "PDF_SEO_LINK_FARM" and another flagging a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that leads to the malicious redirector. The presence of many external links suggests an attempt to manipulate search engine results or distribute malicious content through a link farm.

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=gre+verbal+analogies+pdf
    • http://files.northernboatwholesalers.net/uploads/1/3/1/3/131380728/82081.pdf
    • http://files.ptediting.com/uploads/1/3/1/8/131871816/nawesamojazefamovamo.pdf
    • http://files.inspirare.co.uk/uploads/1/3/2/7/132740214/kolonibobazexumakoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4184/0534/files/28313192564.pdf
    • https://cdn.shopify.com/s/files/1/0428/6365/7119/files/pantheon_cookie_clicker.pdf
    • https://cdn.shopify.com/s/files/1/0428/5369/5647/files/46887393517.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4466/files/79849063451.pdf
    • https://cdn.shopify.com/s/files/1/0432/9340/9438/files/wigozapaxujenidaxuwadoma.pdf
    • https://cdn.shopify.com/s/files/1/0428/7679/7081/files/19232916761.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3645/files/darojudemogoxovovi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6627/7534/files/40009183859.pdf
    • https://cdn.shopify.com/s/files/1/0436/0385/3469/files/kimozazugiwifokopasetam.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4465/files/ritadazupogepaguve.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/gixexanonirugokosab.pdf
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/luvexelidujawepanedil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemisavixazesunomezixe.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_off00008043.bin
2ada88fb3c1d5ffb97098b43870b39ff1f512d68aefe720f24993237ebb9eb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8043 5440 bytes
font_01_sfnt_off000092d4.bin
6b28b6a9da5807709ff3be34ed9c4c1c603d231d343a3a17a25bb65bd1daf960		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92D4 10112 bytes

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