Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9cdd9a25b88ad0…

MALICIOUS

PDF

67.7 KB Created: 2021-01-17 06:39:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7882866d26d2c3a69ea88a980e23ad55 SHA-1: 7506836317a5b71e70274647a69e5110f69dcdab SHA-256: 3a9cdd9a25b88ad09f9bd728fdaa3f11afa07ec03b9dedc50bb7039db34e32ca
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically `traffking.ru`. The document body, though heavily obfuscated, suggests a lure related to 'Spotify unlimited skips apk', indicating a phishing attempt. The presence of multiple disposable hosting links and the ML classifier's high confidence score further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://traffking.ru/123?utm_term=spotify+unlimited+skips+apk In PDF document text
    • https://cdn.sqhk.co/fifenije/ihdje9I/zevavagusakekibife.pdfIn PDF document text
    • https://site-1177969.mozfiles.com/files/1177969/parrot_drone_controller_app.pdfIn PDF document text
    • https://site-1176882.mozfiles.com/files/1176882/belasaxebevukiw.pdfIn PDF document text
    • https://site-1171473.mozfiles.com/files/1171473/lurumaxunupoxita.pdfIn PDF document text
    • https://xunusavijogomos.weebly.com/uploads/1/3/4/7/134702941/gotinexevoz-fedovo-ripepopu-zovalepunob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375088/normal_5fe54339870ef.pdfIn PDF document text
    • https://cdn.sqhk.co/zowesifona/igjjfey/stickman_warriors_gift_codes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411915/normal_5fe6ec18dc665.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447626/normal_5ff260013524f.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/xokebore/xobevudivuwenupirasugenid.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/bambara_nut_flour.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_off0000cafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFD 5360 bytes
SHA-256: bd190f8842dfecfa07abe7ec20f14a267088a774bc6240f183516fd34a1da60c
font_01_sfnt_off0000dd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD37 10836 bytes
SHA-256: 413d01a6153eb47d0863c02ea3b629206b0cd06d9b96d5fb8fe207e94c530f45

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