Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf793ad7d669fd8…

MALICIOUS

PDF

63.8 KB Created: 2020-11-29 10:17:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 508f56591656394e5e3758c9ef0cf294 SHA-1: 9d09127001f7f6a34bdc1d040836ba906d8c5d8e SHA-256: adf793ad7d669fd8a7fc3489350ff2326eb56cf67af7ae94be4a43f165522c4c
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for a malicious redirector link and a high-confidence ML classification. The embedded URL points to a known malicious redirector, suggesting an attempt to lead the user to a phishing or malware distribution site. The document body, though heavily obfuscated, contains text referencing 'Whatsapp messenger apk', likely a lure to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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-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=whatsapp+messenger+apk++apkpure
    • https://cdn-cms.f-static.net/uploads/4374009/normal_5fabba4dcbf21.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fa282842-191b-4fd2-a3ce-a51c7ab86f3d/pezebarosugok.pdf
    • https://uploads.strikinglycdn.com/files/672a4da9-a3e5-4cf1-af43-dd84d33cfcdb/canon_pixma_mg5420_manual_online.pdf
    • https://uploads.strikinglycdn.com/files/910cdf72-1cd7-4687-9527-61b30d879b5b/types_of_metal_alloys.pdf
    • https://uploads.strikinglycdn.com/files/ad04b415-dd58-47bf-9faa-895ab1fd21fe/47850809818.pdf
    • https://uploads.strikinglycdn.com/files/cf981a89-7400-42b2-af68-fa90cfe2db35/73739631487.pdf
    • https://uploads.strikinglycdn.com/files/b6d3fce3-4cdd-4560-83fb-361c086f6676/ff7_android_apk.pdf
    • https://s3.amazonaws.com/gedesisumi/77394906934.pdf
    • https://uploads.strikinglycdn.com/files/fdc8285c-21d0-4cf8-8610-b946f9bd4f2c/5088693556.pdf
    • https://s3.amazonaws.com/sasufufa/jarilenolunusaxitinowi.pdf
    • https://s3.amazonaws.com/metubevozisul/cover_letter_for_finance_job.pdf
    • https://s3.amazonaws.com/kosipefojaw/cablevision_remote_ur2-cbl-cv04_manual.pdf
    • https://uploads.strikinglycdn.com/files/64777ba8-6f50-41df-9b75-52df9a806f09/36342529462.pdf
    • https://uploads.strikinglycdn.com/files/bf5c8406-2266-4515-8466-37548b225411/dissidia_nt_datamine.pdf
    • https://uploads.strikinglycdn.com/files/52a74cb4-0f1a-4a2a-8184-d63b003a7c32/kalenubilelinananoven.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_off0000bb62.bin
f7a46c33486bf64217ebfee33335eb55b66b5d76483fdda393e28edc3cbb879e
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB62 5280 bytes
font_01_sfnt_off0000cd3a.bin
a6d5dfbfffcf03847a18489eaed5b86a0790ea8f6752668d62b26d984a136b6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3A 10732 bytes