Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa367259d3660cb…

MALICIOUS

PDF

69.0 KB Created: 2020-11-18 05:05:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b01880c74783eee818ff0567f6f25cb6 SHA-1: c5fa355031b2cbc7786090ecc6ec7d8c0bcb3d1c SHA-256: 8aa367259d3660cb8b4b6314de81faa2b526336e066176bbe0837eb312732807
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous links designed to redirect users to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The primary malicious URL identified is 'https://cctraff.ru/123?utm_term=towelroot+v5+apk+2019', which is also flagged as an SEO redirector. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

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://cctraff.ru/123?utm_term=towelroot+v5+apk+2019 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367960/normal_5f9007a685e97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390097/normal_5fa6f2747b4bb.pdfIn PDF document text
    • https://jepupuwupojuv.weebly.com/uploads/1/3/4/4/134481076/1539737.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/joxufi-nabuba-fumiwi.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/9392e2c9-3660-467c-9732-262c1ac00e9f/jepotofejipumafujapurexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d91db8e-b408-4d39-ad16-6ce5d7f11d97/60864202790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2128bdf6-2c91-4580-9940-aa272735a9cc/25997531503.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd8131f7-eda6-4e6f-9d4c-0d6bd4b1884e/ilive_sound_bar_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a2a28d3-918e-44ae-bbd5-2ec4cec24ace/19960809370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/655e48b0-aef3-464b-a57d-52536c257590/rare_amc_muscle_cars.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/application_for_child_care_leave_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/zakakejegenapapeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/236d7c1b-9bee-4b2a-ac01-77b43a1e4e7d/comment_pour_nettoyer_squishy_balle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9162cd32-8323-4499-95f3-f5cec1687420/63303998615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4ab09f8-a585-4ce9-93ee-ea3ebf589835/5982507863.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_off0000d15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15C 5408 bytes
SHA-256: f33f7fc6783b911f8a89188f8dd5043db68b044a69c26afadd9de9db344cfb89
font_01_sfnt_off0000e3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F3 10412 bytes
SHA-256: 98e692fc50261f20c1f90104c5d4689b2ea68299d692c86bc86f1a766bd1af9a

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