Malicious PDF — malware analysis report

Static analysis result for SHA-256 6146809a751bf1a9…

MALICIOUS

PDF

41.5 KB Created: 2020-08-25 08:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1559dda63772d062539c9a264af822a0 SHA-1: 9c38a0e90a86631b8df2674c634eba08a2846c59 SHA-256: 6146809a751bf1a94d304ebffbc46b170abbd9cf2194614a5a458601ce43a1b3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body text, though partially obfuscated, mentions 'gaming graphics card' and includes a URL that appears to be a lure. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a link farm or redirection scheme designed to lead users to malicious content.

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.cc/pify?keyword=gaming+graphics+card++for+windows+7
    • http://files.molyneaux.com/uploads/1/3/0/7/130776602/bede8fcc.pdf
    • http://files.andersonolineacademy.com/uploads/1/3/1/8/131858916/sekagedoko.pdf
    • http://kibapa.artfix.info/uploads/1/3/1/8/131871449/gixenovemafawu_runowajen.pdf
    • http://livepe.monicaqiu.com/uploads/1/3/2/6/132681670/2018147.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2956/9434/files/aspects_score_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0430/9073/9361/files/lagukos.pdf
    • https://cdn.shopify.com/s/files/1/0429/9322/1783/files/xetegijovigomi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/gigilarujideg.pdf
    • https://cdn.shopify.com/s/files/1/0434/2022/1607/files/zipozefobewilutakogesigug.pdf
    • https://cdn.shopify.com/s/files/1/0431/0922/0501/files/free_html5_admin_templates_2019.pdf
    • https://cdn.shopify.com/s/files/1/0434/6796/4580/files/wuluxefevudizinobekal.pdf
    • https://cdn.shopify.com/s/files/1/0445/7860/3167/files/89264039573.pdf
    • https://cdn.shopify.com/s/files/1/0436/5477/4949/files/30233804197.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_off0000620d.bin
ac95c3a6589d26b7a4f7a1163abd49350dfe4cfe04cf1d9d552026e9b638a60e
pdf-font-stream PDF embedded font (sfnt) at offset 0x620D 5740 bytes
font_01_sfnt_off0000757d.bin
da09c8d1da3dedb9976e5266a11572e3016836d0483ae00a39301d1a017921fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x757D 10484 bytes