Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4157d4e21882a7a…

MALICIOUS

PDF

45.4 KB Created: 2020-10-02 14:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7ecf116949f380efa4ea183080080c3f SHA-1: 58f1ff30ca2e8775627eedb6181bcf63ae4c152f SHA-256: b4157d4e21882a7a259a0f645de2c76f2baf5c075763d7cdedcbf7ab744edc87
124 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to a link farm, a common technique for SEO poisoning or distributing malicious content. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of known malicious redirector infrastructure. No scripts were extracted, but the structure and embedded links suggest an intent to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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://cctraff.ru/strik?keyword=sc2+co+op+kerrigan+guide In PDF document text
    • https://site-1039346.mozfiles.com/files/1039346/pavojovojusasu.pdfIn PDF document text
    • https://site-1040509.mozfiles.com/files/1040509/nulufuzelivevagik.pdfIn PDF document text
    • https://site-1036835.mozfiles.com/files/1036835/fakowogobuvisi.pdfIn PDF document text
    • https://site-1039465.mozfiles.com/files/1039465/20488312427.pdfIn PDF document text
    • http://files.adieudepression.com/uploads/1/3/2/7/132740914/semuxageje.pdfIn PDF document text
    • http://ketator.heritagefloristcortland.com/uploads/1/3/1/4/131453558/6172085.pdfIn PDF document text
    • http://ligutiku.adashofclass.com/uploads/1/3/1/8/131856316/segajomatuket-sajelonazesez.pdfIn PDF document text
    • https://site-1039517.mozfiles.com/files/1039517/16516658524.pdfIn PDF document text
    • https://site-1037175.mozfiles.com/files/1037175/26038688150.pdfIn PDF document text
    • https://site-1038349.mozfiles.com/files/1038349/83728440608.pdfIn PDF document text
    • https://site-1038309.mozfiles.com/files/1038309/zenukizevodu.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/9373b004-ed68-4c5e-9d27-064d8ac63f0c/fefolidefekuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d815a3b0-7dda-44bb-ae53-638236237004/76222567334.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_off00006a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A9A 5332 bytes
SHA-256: 192982c9b537fbc657284b3085fc356f119217a97788d3ea4308f64e4020410d
font_01_sfnt_off00007ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CCB 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00008558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8558 10400 bytes
SHA-256: 8272b0c527e4fe1ce065e905183327b803b055f7af224affe55c1612ed93fc96

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