Malicious PDF — malware analysis report

Static analysis result for SHA-256 dad7c4a12f582c73…

MALICIOUS

PDF

98.3 KB Created: 2020-12-30 02:37:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 437252149346cb22f03fbc978b6a1702 SHA-1: 6720a05b4f0afcf805ee5f234a8a6cbba7590bbe SHA-256: dad7c4a12f582c736543067bb579d2d9085cd33cd3f9a37fa8cb0bf5257c1589
254 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to downloads and potentially lures, consistent with an advance-fee scam. The presence of numerous embedded links, including one pointing to a malicious redirector, strongly suggests an attempt to redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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/strik?utm_term=run+royale+3d+download
    • https://julalawigito.weebly.com/uploads/1/3/4/8/134869680/1525536.pdf
    • https://cdn.sqhk.co/tonuviwa/LjdAf8l/68990606519.pdf
    • https://xuzijobozu.weebly.com/uploads/1/3/1/4/131411245/372d383f9959e1.pdf
    • https://cdn-cms.f-static.net/uploads/4393790/normal_5fada1a2b6a95.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://s3.amazonaws.com/rilexazejuzovep/54754803711.pdf
    • https://uploads.strikinglycdn.com/files/309a76a3-f026-40a6-8a8b-ee01cc09043a/orang_orang_biasa_andrea_hirata.pdf
    • https://uploads.strikinglycdn.com/files/098757de-5085-4536-aa1d-b594bbba4861/37110645366.pdf
    • https://uploads.strikinglycdn.com/files/21ea12fd-858c-46d6-b305-c390194b31cf/konji_pesida_venaam_video_song_downl.pdf
    • https://uploads.strikinglycdn.com/files/5ac9ed24-aa0d-47ae-ba06-3a6ba8049cb0/lol_yasuo_guide_german.pdf
    • https://s3.amazonaws.com/faluzotixupi/38509733882.pdf
    • https://uploads.strikinglycdn.com/files/b854d172-1076-4157-88e0-48658dafa046/82265098347.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4f6.bin
2a21520d7a09baaadaeecb719c70a6c41bb38d4f782dbec3296578b136ba88a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F6 21328 bytes
font_01_sfnt_off00012954.bin
f4d19937ce7560e1f436fdd95781190dffa8ac3e03ecd73ea5cf1a6cf9ea24ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12954 5004 bytes
font_02_sfnt_off00013a77.bin
2368e889a5c606dc0cee39aa0e5104c09cfcaf26c09672165a99767037da04f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A77 8880 bytes
font_03_sfnt_off00015371.bin
8421a8ac9d54b206893708eef57a4a1ce6e72ffc8cadf353097423caf8d7a544		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15371 12352 bytes

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