Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2dcf27b193455e1…

MALICIOUS

PDF

70.2 KB Created: 2021-01-01 17:49:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 911b71638454e5dec6670ed5eb31a14e SHA-1: 140518e8c007a6e894b6cdb41d99d3e9651ba3e8 SHA-256: a2dcf27b193455e11dd4380ebc6e72b0ad2d5d4bc629c2b14e0cfdc420c602fc
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also returned a high confidence score for maliciousness. The embedded URL `https://cctraff.ru/123?utm_term=catit+design+smartsift+sifting+cat+pan+australia` is the primary indicator of malicious intent, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://cctraff.ru/123?utm_term=catit+design+smartsift+sifting+cat+pan+australia In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_5fb85d88cccdb.pdfIn PDF document text
    • https://pelixenebedevo.weebly.com/uploads/1/3/4/3/134338689/3bf1e4f361d9.pdfIn PDF document text
    • https://jimurapixow.weebly.com/uploads/1/3/5/3/135399705/8569305.pdfIn PDF document text
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/3235797.pdfIn PDF document text
    • https://jabekidedur.weebly.com/uploads/1/3/1/6/131636775/jumereseximewof-lesib.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/pefepo.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/1fe0947c-0fb5-4e82-acfe-a1a8aa142a7d/kimapilunefexexubavod.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/android_mobile_software_update_kaise_kare.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/hacked_8_ball_pool_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9280229d-7809-4393-95c7-eadf0032c458/schenectady_county_zip_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f14ffd3b-a24f-4822-a49a-d052b8accebb/quintessential_quintuplets_season_2_manga.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_off0000d417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD417 5380 bytes
SHA-256: 4c92d79cb2f4883c322fe33648f0f3fdd671f8ad3a329ab4961d589cdafb99af
font_01_sfnt_off0000e64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64C 10652 bytes
SHA-256: 43e516f705b3725912d1e4531e0d2ba02c346c9ed21c3f9b12aff4187d65966b

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