Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad955b7927b2feb4…

MALICIOUS

PDF

73.9 KB Created: 2020-11-10 00:31:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d538ac05a997760f08f710254358daf1 SHA-1: ee7322970e391a3c9aa536ef8b0cafc91aeaacbb SHA-256: ad955b7927b2feb4fb0971e88d604d1bedb2fc48039917ae16c2d5ba24b1c649
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, and it contains a critical heuristic indicating it links to known malicious redirector infrastructure. The embedded URL 'https://traffmen.ru/strik?keyword=libro+el+martillo+de+las+brujas+gratis' is the primary indicator of malicious intent, likely serving as a lure for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and the malicious URL strongly suggest an attempt to compromise the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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
  • 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://traffmen.ru/strik?keyword=libro+el+martillo+de+las+brujas+gratis
    • https://jazexupojofon.weebly.com/uploads/1/3/1/4/131409098/343815.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b7a45ea2-739b-48ad-9b01-0b7a9d746598/kotojabupagos.pdf
    • https://uploads.strikinglycdn.com/files/2929a790-f785-4877-be41-a1e8a2e3e333/joker_full_movie_hd_online_free.pdf
    • https://uploads.strikinglycdn.com/files/cbaf5849-fa45-47ff-9f11-35c4fad5ef67/combining_like_terms_worksheet_7th_grade.pdf
    • https://uploads.strikinglycdn.com/files/3f76588e-fd7d-44c9-988f-37388e42f8d0/suwanafibewureg.pdf
    • https://uploads.strikinglycdn.com/files/8bb77d02-f953-44b3-94dc-b0eace860e73/57234692766.pdf
    • https://uploads.strikinglycdn.com/files/96a6a1e1-4c7b-47f9-bf13-41723995201c/jogutamapekogasovizos.pdf
    • https://uploads.strikinglycdn.com/files/861731fc-7158-4221-a573-3d0bfdb34479/pamimekumagemovaxakapodug.pdf
    • https://uploads.strikinglycdn.com/files/092ca575-c88b-4883-bfad-c880b64a6f4b/gamekit_survey_scam.pdf
    • https://uploads.strikinglycdn.com/files/af756422-192b-42f2-92c2-14556b9aa192/41050070831.pdf
    • https://uploads.strikinglycdn.com/files/2113a0c9-c9a5-4ce8-996d-95ed715623e4/60857242035.pdf
    • https://uploads.strikinglycdn.com/files/b16df857-99f8-4948-874b-4b09f277039b/megodinutusazudarir.pdf
    • https://uploads.strikinglycdn.com/files/cbc2b2ff-2472-45ec-82ae-ab1a365a230a/php_convert_to_image.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_off0000e19f.bin
70bef80369c1e6fbd258296d4c05b5eb2439ec6be0d5b302aee7c5c491922167		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE19F 5300 bytes
font_01_sfnt_off0000f38d.bin
c6db34af0df31b23c89b0e5674e93ce54fdf9298e6b587681235629afe48d3ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 11624 bytes

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