Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49fb77e52bab095…

MALICIOUS

PDF

42.8 KB Created: 2020-11-08 15:42:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: eac7b6dcbd0bc76a6886df085210dc4e SHA-1: b225f313b279e1812bf91d0e19b76e102b4a475d SHA-256: d49fb77e52bab09554950275f86312c0950a4a20eb405573a97560113506a5af
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The primary URL, https://trafffe.ru/123?keyword=steve+nison+the+candlestick+course+pdf+free, appears to be a lure to drive traffic. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/123?keyword=steve+nison+the+candlestick+course+pdf+free PDF link annotation
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/9996348.pdfIn PDF document text
    • https://gexaxiwiwa.weebly.com/uploads/1/3/4/4/134480231/gaxuzosuvuwenetiz.pdfIn PDF document text
    • https://zukinubugepar.weebly.com/uploads/1/3/4/5/134514864/savaribavi_nejavez.pdfIn PDF document text
    • https://zamomojufowa.weebly.com/uploads/1/3/4/6/134613680/juxavados.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3db39247-a0c9-454e-a3a5-135c10fa9d89/nemavizojupetuzukev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad7a6015-97ea-45ce-a901-bbe8db5cca03/60323799965.pdfIn PDF document text
    • https://tijuped.files.wordpress.com/2020/11/sopa_de_letras_elementos_quimicos.pdfIn PDF document text
    • https://dakowawije.files.wordpress.com/2020/11/zakagajopisarirevuwadala.pdfIn PDF document text
    • https://liwefibago.files.wordpress.com/2020/11/kolidiniganapebetaguwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90c2c4eb-611e-491e-979c-eaeb5af5e59d/filufafunororagovuj.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/87905429613.pdfIn PDF document text
    • https://xeruluzolu.files.wordpress.com/2020/11/31522472749.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B3E 5468 bytes
SHA-256: 3859a10ac91682d5e674e8aa12f2b4bb602f95da377ca14c9963889dd8511ab6
font_01_sfnt_off00006dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDA 2048 bytes
SHA-256: 1c6523dcb7f1ca7db05b1a2befcc63f3a2018e809564172c373e39fb0a4d68de
font_02_sfnt_off000076b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76B9 10964 bytes
SHA-256: 91d5655d202aa7f94b4f7744f13ed488690e26764ff4d85e61a6e853b7dc2615

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