Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaff28ae80958e9d…

MALICIOUS

PDF

69.0 KB Created: 2021-01-14 11:12:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 324c08452d20393f86e7d917e42cb0b6 SHA-1: 7ef73269a037038a893c103e5b3fc6bc004756dc SHA-256: aaff28ae80958e9d9f000d4e6cbd07174d8463df2ced93d4c796d9dc1acbe9a4
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document's structure suggests it functions as a link farm, likely designed to direct users to phishing sites or download further malicious content.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/aws?utm_term=yard+feet+inches+worksheet
    • https://site-1245376.mozfiles.com/files/1245376/96126958602.pdf
    • https://site-1168448.mozfiles.com/files/1168448/7_minute_workout_app_free_download_for_pc.pdf
    • https://site-1083781.mozfiles.com/files/1083781/horizon_chase_world_tour_download.pdf
    • https://site-1244472.mozfiles.com/files/1244472/89762957692.pdf
    • https://site-1167950.mozfiles.com/files/1167950/virgin_media_moving_home_form.pdf
    • https://site-1176864.mozfiles.com/files/1176864/73735840775.pdf
    • https://site-1174847.mozfiles.com/files/1174847/incident_report_template_word_south_africa.pdf
    • https://pativezakuzorad.weebly.com/uploads/1/3/4/2/134266084/fitaxipitezanejabif.pdf
    • https://jewotefajasofu.weebly.com/uploads/1/3/2/7/132741420/4023345.pdf
    • https://witabavuwimob.weebly.com/uploads/1/3/4/3/134339013/lowutanun_xavun_vidulebexeluk.pdf
    • https://site-1177706.mozfiles.com/files/1177706/teddy_bridgewater_college.pdf
    • https://golisarupu.weebly.com/uploads/1/3/5/3/135317681/bubivut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/putelekireza/magnesium_most_bioavailable_forms.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_off0000d12f.bin
2017b0fb919f693f05b5acb468aa2bfad2f87aae691383351211c1d2c87cdd25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD12F 5192 bytes
font_01_sfnt_off0000e2ec.bin
ff288c313274e4097697dc190206ebdc0c3b7487075ed318f97c655c949a05d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 10772 bytes

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