Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2b9a68e0a245e5…

MALICIOUS

PDF

63.8 KB Created: 2020-12-28 00:18:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b8b7f506b997eec01eb24768fc559c0e SHA-1: 1f5eee332f7356cffa10ff5976cdd44eeaea88cf SHA-256: 6a2b9a68e0a245e56697a3821c167e47546c4f7b4138993b3b842036813f046b
254 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at `https://traffking.ru/strik?utm_term=fun+run+race+3d+mod+apk`. This URL is likely used to funnel victims to phishing pages or download further malicious content. The presence of a large number of external PDF links also suggests a link farm or SEO abuse for distribution. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffking.ru/strik?utm_term=fun+run+race+3d+mod+apk In PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/3510719.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/heFgcn1/27049090019.pdfIn PDF document text
    • https://cdn.sqhk.co/vikoparif/rp1gdha/53363183468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370302/normal_5fc0267393170.pdfIn PDF document text
    • https://menufepu.weebly.com/uploads/1/3/1/1/131163725/tofapazadan-nanawir-pobufi-tumofevevik.pdfIn PDF document text
    • https://cdn.sqhk.co/zavufepugife/jejXjhz/white_metal_triple_sleeper_bunk_bed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451217/normal_5fa4bd49534bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464995/normal_5fa424f011934.pdfIn PDF document text
    • https://cdn.sqhk.co/zipodumup/ithagcR/wodiwobunaxifetarane.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/S1zEqsB/47572027217.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wulagisi/3742429389.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/82508821125.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_off0000be7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7E 5192 bytes
SHA-256: 9e98db7f69c81f8a8b99a2972091fce4988ba1bc271986f4378db89a37c66eec
font_01_sfnt_off0000d019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD019 10164 bytes
SHA-256: 1a9b3b8a600c4d11795f6534beb48b858b841c0276eb128c11e90f7261e42fcf