Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d7e7b28847a86d…

MALICIOUS

PDF

72.3 KB Created: 2020-11-14 07:19:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e037429ae41b054aa0ae3346ef6581e8 SHA-1: 7320a2b2967d377b2347a9a466346a7224e0dd47 SHA-256: 88d7e7b28847a86d4c51e17842557318691c954da2566792df2216e2896ac6c1
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document is classified as malicious, containing a link farm designed to redirect users to potentially harmful sites, including a known malicious redirector. The document's content, though obfuscated, appears to be a lure, possibly related to a golf tournament, to entice users to click on these links. The presence of multiple embedded URLs and the critical heuristic firings strongly suggest an attempt to distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=best+ball+format+golf+tournament
    • https://rejileju.weebly.com/uploads/1/3/4/3/134335231/lajexitig_punekus_nevonarer.pdf
    • https://digufotunu.weebly.com/uploads/1/3/4/2/134266503/gagalejori-samanis-lomexuwisejeva-zeguxojawi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/95bcca7f-3851-4271-b1ce-cb337f4ec824/zakulabinek.pdf
    • https://s3.amazonaws.com/jukoxisojow/40_fl_oz_of_water_to_pounds.pdf
    • https://s3.amazonaws.com/napejaxosinages/suzuki_book_4.pdf
    • https://uploads.strikinglycdn.com/files/93816069-6926-4afd-aadc-44d568a4b962/the_blue_zones_solution_by_dan_buettner.pdf
    • https://uploads.strikinglycdn.com/files/2d56efc4-ddf0-40c4-a158-21cfde5383d0/5220523783.pdf
    • https://s3.amazonaws.com/zaxawetawupo/lumabuxon.pdf
    • https://uploads.strikinglycdn.com/files/d5e8cc0a-b339-42df-b85d-0583d56a8228/knex_rippin_rocket_roller_coaster_instructions.pdf
    • https://s3.amazonaws.com/wonoti/56547579982.pdf
    • https://uploads.strikinglycdn.com/files/e1166851-b8bd-4cd4-b5ad-2ed29054580d/comparing_and_scaling_3.1_answers.pdf
    • https://s3.amazonaws.com/vekodupiwarobi/what_is_the_best_way_to_watch_spider-man_homecoming_for_free_online.pdf
    • https://s3.amazonaws.com/lumixi/budonobejorirupez.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_off0000dd7f.bin
12aec5284a22fdd83f1382357e6d528ac4a8d6dfad513842c56a032e4ce5dacd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7F 5276 bytes
font_01_sfnt_off0000ef62.bin
bc8c94af2ee95f4fedfea1b6ed83741ef672214f2ca028ec27c6b259793f1fe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 10716 bytes

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