Malicious PDF — malware analysis report

Static analysis result for SHA-256 b948891cb1380c80…

MALICIOUS

PDF

38.3 KB Created: 2020-10-07 05:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0aa19adedfb9af13bd5f28ce2048d58d SHA-1: 72c8edf77829032d175d937e91af503f466412d7 SHA-256: b948891cb1380c809841c86033af487c1b01115a9f9fc73af70558a91ea60e5e
184 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links pointing to various domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains the text 'What is a roll axis' and the URLs, suggesting a lure to potentially malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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.
  • 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/pify?keyword=what+is+a+roll+axis In PDF document text
    • http://files.adamsteinbachonline.com/uploads/1/3/1/3/131384602/2299552.pdfIn PDF document text
    • http://gedexat.smiths2argentina.com/uploads/1/3/1/3/131380550/b04a311d187.pdfIn PDF document text
    • http://kewumev.k2ap.net/uploads/1/3/0/7/130775971/567eafd.pdfIn PDF document text
    • http://negeval.alphaplt.com/uploads/1/3/0/9/130969663/dapelukevi-savudezoviv-nifujawapexovob.pdfIn PDF document text
    • http://fokowuva.guitarcram.com/uploads/1/3/1/3/131382700/502ea.pdfIn PDF document text
    • http://files.kolokolkvass.com/uploads/1/3/1/4/131406563/fujozokakekefivuge.pdfIn PDF document text
    • http://files.vickisoarart.com/uploads/1/3/1/4/131410479/girugifuni.pdfIn PDF document text
    • http://files.madelinedonnerstag.com/uploads/1/3/1/4/131407102/jirofujume_gozoko_pujojerunevujux.pdfIn PDF document text
    • http://files.montaukbeachbungalow.com/uploads/1/3/1/4/131438557/delekoti.pdfIn PDF document text
    • http://files.allthingsparanormaltx.com/uploads/1/3/1/4/131406885/356585c9e3087c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0860/4829/files/navy_uniform_regulations_anodized_medals.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3950/5054/files/26591643763.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9777/1176/files/nepazowe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5145/6411/files/81243429920.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_off00005a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A1C 4856 bytes
SHA-256: 0a88a6a51ea04425d81ecaffe3d83ec37f5603ca4a75b3a2af077e43e23680f1
font_01_sfnt_off00006aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA5 9980 bytes
SHA-256: bc3d102c3d437899d6fbe669517e64324859fdde3b91ee72513f2ae497b532a4

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