Malicious PDF — malware analysis report

Static analysis result for SHA-256 850a919393d0d3f7…

MALICIOUS

PDF

42.8 KB Created: 2020-07-09 17:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80df5da4cb42be338052e2c3743fd059 SHA-1: 15ee0239aaa51c0903008136ef864b19fdf07a93 SHA-256: 850a919393d0d3f7e13cd991c69a186970a3c95e95e51e29d8c93abb3d11f238
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files hosted on numerous disposable domains. One URL, 'https://ttraff.cc/wb?keyword=800%20mw%20supercritical%20boiler%20pdf', is flagged as a known malicious redirector. This indicates the document is likely part of an SEO manipulation scheme or a distribution mechanism for further malicious content, leveraging a link farm to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wb?keyword=800%20mw%20supercritical%20boiler%20pdf
    • http://files.rivermenrodandgunclub.com/uploads/1/3/2/3/132302973/nomegariwutok-wibiwu-visinatixubuj-sojimuta.pdf
    • http://files.ezkennel.com/uploads/1/3/1/1/131164039/4571276.pdf
    • http://files.koahspearguns.com/uploads/1/3/0/8/130813849/worabugesezu_fowipe.pdf
    • http://files.houseofjs.coffee/uploads/1/3/0/8/130873849/bedelezimupati.pdf
    • http://files.toltc.com/uploads/1/3/0/7/130775752/moxogifag_liwunapewor_towukolod_pukopekoj.pdf
    • http://files.chickyfarmsvintage.com/uploads/1/3/2/6/132695424/7853380.pdf
    • http://files.quapawcattlecompanystore.com/uploads/1/3/1/3/131379325/7395164.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://kipivewije.files.wordpress.com/2020/07/31079622035.pdf
    • https://tatinujafe.files.wordpress.com/2020/07/76221671194.pdf
    • https://xegetiku.files.wordpress.com/2020/06/majiwuzat.pdf
    • https://vezobufo703077091.files.wordpress.com/2020/07/34908945040.pdf
    • https://purupale.files.wordpress.com/2020/06/rekavixasisa.pdf
    • https://pezufonitibi.files.wordpress.com/2020/07/63594611786.pdf
    • https://zilafodevoje.files.wordpress.com/2020/06/gugediju.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/71482320097.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejukimuvili.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ropuxikasafomudixaxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40429789840.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96258555683.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zudofujavulasosajawigubi.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_off0000684c.bin
5616ba591fa40152f3e899aa7148c08eeb5d7fa0de4772b3b71df6b8df728e36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x684C 5552 bytes
font_01_sfnt_off00007b30.bin
ba9cd0f6d5257f7259fdcc27041f791dadbd9f27aa6598a1d6a8e7e980fe6cc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B30 10140 bytes

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