Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0dcacee75083a1…

MALICIOUS

PDF

73.0 KB Created: 2020-11-22 01:17:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f25105a55c8790da6592120057005980 SHA-1: 1dbbe16db39211340566ab1d427cfecf4fd428a7 SHA-256: 4f0dcacee75083a1e06b824ffbe11560fe44ad5b60af41ec2f7a545e676ab15a
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirectors or unknown domains, indicating a link farm designed to distribute malicious content. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to a known malicious redirector, suggesting the document's primary purpose is to lead users to harmful sites. The ML classifier also strongly indicates maliciousness.

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://ggtraff.ru/aws?utm_term=minecraft+crafting+guide+mod+1.+12
    • https://jagotizepevex.weebly.com/uploads/1/3/4/4/134464701/3d56a88b36.pdf
    • https://robivitoj.weebly.com/uploads/1/3/4/3/134334713/7254728.pdf
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/9038680.pdf
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/a1b4a.pdf
    • https://cdn-cms.f-static.net/uploads/4412591/normal_5fa58a853cbf0.pdf
    • https://cdn-cms.f-static.net/uploads/4417523/normal_5f99ad33596f8.pdf
    • https://xazapadikud.weebly.com/uploads/1/3/1/8/131871762/redazanifebejowi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7fb4838b-6e36-4a91-85d3-37694753cd93/tv_channels_streaming.pdf
    • https://s3.amazonaws.com/pujirageg/gabinejomagodekevisil.pdf
    • https://s3.amazonaws.com/bubodeliza/fofimesapu.pdf
    • https://s3.amazonaws.com/mazugezijap/jelajakujuvum.pdf
    • https://s3.amazonaws.com/bipovoromoj/koboraferuvegojadejok.pdf
    • https://s3.amazonaws.com/wilugugo/vetumixorineli.pdf
    • https://s3.amazonaws.com/tabobujimo/triple_five_soul_hats.pdf
    • https://uploads.strikinglycdn.com/files/ec328646-d830-4265-bb1b-97921a01efb9/principles_of_information_systems_11th_edition_download.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c708.bin
b0646db8c34d09143070026b926158c644ee969c3612f7e46fd83af480930d38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC708 5352 bytes
font_01_sfnt_off0000d93b.bin
1ae2c874d4d6d3de880a0b77423b2aa8a794f4ee7e9b115657cc921c41c66e0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD93B 11424 bytes
font_02_sfnt_off00010059.bin
f7fb55aa7df24da556f1e6a14ff3e973b5c7274e6851c040e899454d18355684		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10059 16064 bytes

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