Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab6344e1cda5172…

MALICIOUS

PDF

43.2 KB Created: 2020-07-28 21:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78969098799908659518eac2a926fed6 SHA-1: 834e74a405cde092e538a3c2fe0a8a34e0933816 SHA-256: 7ab6344e1cda5172d11cf888f1cec988597fdc054349702a9a9d9ffd0685bb77
154 Risk Score

Malware Insights

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

The PDF contains numerous links designed to create a link farm, with one prominent link redirecting to a known malicious URL. The document body, though heavily obfuscated, appears to be a lure related to educational content. The ML classifier strongly indicates maliciousness, and the presence of a redirector URL supports a phishing or malicious content distribution attack pattern.

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=graphing+functions+worksheet+algebra+2
    • http://files.peachyboho.com/uploads/1/3/0/9/130969277/kokotapudiguv_rakajegokeruf_kijisokorob.pdf
    • http://files.retrogamergear.com/uploads/1/3/1/3/131383333/pubuw.pdf
    • http://files.thechhe.com/uploads/1/3/0/9/130969389/2615609.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0277/3156/files/39627713366.pdf
    • https://cdn.shopify.com/s/files/1/0439/9159/7214/files/61947200372.pdf
    • https://cdn.shopify.com/s/files/1/0430/0174/1463/files/savuruvanew.pdf
    • https://cdn.shopify.com/s/files/1/0434/9480/1568/files/38165470684.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99913566500.pdf
    • https://cdn.shopify.com/s/files/1/0431/6423/7992/files/kigapiwutifimo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1295/files/bidoni.pdf
    • https://cdn.shopify.com/s/files/1/0434/4047/2229/files/26760519531.pdf
    • https://cdn.shopify.com/s/files/1/0432/9707/9460/files/24929638691.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5362/files/sapijepupapowupekiza.pdf
    • https://cdn.shopify.com/s/files/1/0438/6911/0432/files/78143161447.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/91720542607.pdf
    • https://cdn.shopify.com/s/files/1/0432/0247/8242/files/liramejegik.pdf
    • https://cdn.shopify.com/s/files/1/0434/7055/3250/files/xekizarekuwaviz.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_off00006893.bin
24f331a01eb3e035b76d915876ad3849ddb28b5a078464c1ad0b1573639b3fde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6893 5620 bytes
font_01_sfnt_off00007bc1.bin
efc4be957b6e36308b5a0e0a10ecadbb44897f1528becf99c6151717cf3483f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC1 10088 bytes

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