Malicious PDF — malware analysis report

Static analysis result for SHA-256 243a315f78503cf8…

MALICIOUS

PDF

68.4 KB Created: 2020-12-20 14:52:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 128eacd24de230a3f9271e5a445d39af SHA-1: 1533aa25ee2134c57c3acb57ebeb39ff34eec7c7 SHA-256: 243a315f78503cf8fcf55902a080c4146be50caa1091b2715496b5c740ccaa21
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://cctraff.ru/strik?utm_term=fallout+4+strategy+guide+download'. This URL is presented as a download for a 'Fallout 4 strategy guide', indicating a phishing or scam lure. The PDF also contains a large number of external links, many of which point to S3 buckets, suggesting a link farm or SEO manipulation tactic to distribute malicious content. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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=fallout+4+strategy+guide+download In PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/0c18874847f.pdfIn PDF document text
    • https://mesemexuganu.weebly.com/uploads/1/3/1/4/131437531/bivesarodifut_powepo.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/pavujiniz/29215589594.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/happy_new_year_song_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/fokimibinivibokebifuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef7b7e7f-92a2-4b87-a488-c70afd1def61/refoxemipexopexesob.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/calculus_1_file_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/rekigojikifez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6259495d-81d4-4921-93f4-4679a0466007/50444134959.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/baidu_er_firefox.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/pasovut.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/91743530866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0b92f58-f082-40e7-980b-5407526fb114/balatatesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d63126ca-8031-45d6-ab00-f2868ad4fdd6/51428470161.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_off0000cc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC25 5228 bytes
SHA-256: f49827ae5d16753c4eec1588cf2dd6fde33dc5fadeb8f950a72397a6cbfe5ef1
font_01_sfnt_off0000de1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1B 11696 bytes
SHA-256: a156eb6a90c89df8bb56b5cb76a109ff5afdc9ca09341cf6aeb0b42a1cb8c169

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