Malicious PDF — malware analysis report

Static analysis result for SHA-256 113f0fd2f79e7bef…

MALICIOUS

PDF

51.6 KB Created: 2020-08-11 08:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef3a8d474085e2a9d128d6489844c3ca SHA-1: e2591173be7c2d5013a03db12c0c029abb8191ab SHA-256: 113f0fd2f79e7bef3b6358ac60627ea9e7bce5a0dbe248bd2c63d76751b19982
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 external PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary links directs to a known malicious redirector infrastructure at 'ttraff.com'. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attempt.

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/wb?keyword=iran%20cyber%20security%20strategy%20pdf
    • http://files.tylershipmanmemorialcarshow.com/uploads/1/3/1/3/131397973/529ce78.pdf
    • http://files.compasswellnesscoaching.com/uploads/1/3/0/8/130874543/1997618.pdf
    • http://marofuje.meagangipson.com/uploads/1/3/0/7/130776418/cfafcc2815d135.pdf
    • http://files.yenbai.life/uploads/1/3/0/7/130739340/depuxewodirekabamir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85213016947.pdf
    • https://cdn.shopify.com/s/files/1/0429/6356/6755/files/viluvoketetipofunonelemi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12035000993.pdf
    • https://cdn.shopify.com/s/files/1/0433/3849/8206/files/nulimevegulafajoga.pdf
    • https://cdn.shopify.com/s/files/1/0431/5358/8390/files/patupimamevenuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sakemiribukewud.pdf
    • https://cdn.shopify.com/s/files/1/0435/2344/0792/files/95657822730.pdf
    • https://cdn.shopify.com/s/files/1/0434/8765/8141/files/jupukisepexasatekipip.pdf
    • https://cdn.shopify.com/s/files/1/0432/3688/4642/files/mukuxezolumixigurevanog.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/mowuzateta.pdf
    • https://cdn.shopify.com/s/files/1/0436/6453/9798/files/44519632586.pdf
    • https://cdn.shopify.com/s/files/1/0435/0086/3643/files/calidad_total_y_productividad_segunda_edicion.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000a420.bin
8a6174901ba5057ec46441f3570e24d006e178234556581f6e5928422e308d6a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA420 18676 bytes
font_00_sfnt_off00006e35.bin
ba067b8cd6bb1ef84ce8f3d66c73ec3437904a531fa112da5e923cafe4b72e9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E35 5472 bytes
font_01_sfnt_off000080da.bin
2ae7b822e8e010ba702d29d9a7956e2397b4d52e032000d71059d981643fe035		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80DA 10288 bytes

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