Malicious PDF — malware analysis report

Static analysis result for SHA-256 d781efa982e4d011…

MALICIOUS

PDF

76.3 KB Created: 2020-12-27 05:09:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5939899f11891b127e2dccf720183394 SHA-1: 9a7cc80004d8f4421ab038ed44d50d35968c9ca5 SHA-256: d781efa982e4d01189a3a465726fdd401dd8517a589da5190ce3ee296c625f7a
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ggtraff.ru', which is used to distribute malware. The ClamAV detection and ML classifier further support the malicious nature of this PDF, likely intended to phish users or lead them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/aws?utm_term=temple+run+2+cheats+apk+android In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369933/normal_5fe780662904e.pdfIn PDF document text
    • https://cdn.sqhk.co/gujadozede/jagcjfh/ultimate_buggy_kart_race_track.pdfIn PDF document text
    • https://cdn.sqhk.co/kivuwutu/eYT6jfF/mobile_wallet_android_github.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423752/normal_5fafa7ba7fe8e.pdfIn PDF document text
    • https://cdn.sqhk.co/bixatavafut/UHDxfo4/extreme_car_simulator_download_apk.pdfIn PDF document text
    • https://vukuzimina.weebly.com/uploads/1/3/4/1/134109202/259fff27a7ef053.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497688/normal_5fe1ccd8d172d.pdfIn PDF document text
    • https://cdn.sqhk.co/madeparev/e6hfYgg/17203317447.pdfIn PDF document text
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/2530490.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/xidulugetewejik.pdfIn PDF document text
    • https://cdn.sqhk.co/mifimafonuku/iQfifjg/ziginox.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/1jbTcha/chex_quest_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/ligilitojob/LjeggUB/walmart_money_card_fee_free_atm.pdfIn PDF document text
    • https://gakuzelidojipo.weebly.com/uploads/1/3/4/3/134395763/rozopar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b25ea92-a6e7-40a1-ae2a-cb9d99bbe93d/sajubigubi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 5456 bytes
SHA-256: 7bae78cb1980b56585a03a0baf311d95f6cdc4083763a3b303d97ba54046c2fb
font_01_sfnt_off0000fdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF6 11232 bytes
SHA-256: e956ee16180408da94fca9d0b6270cdf474a0abbcad2b1b5083bf657158defc3

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