Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0376c1740af72e0…

MALICIOUS

PDF

53.3 KB Created: 2020-10-11 16:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 54563672a676ec698c8a76a183f50680 SHA-1: 1a8f17c18b7f896dcaa7a534d0308bc3173627f2 SHA-256: f0376c1740af72e00d2ba9ee241816b9400496d00200136e1a21db031dd21b89
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a reference to the malicious URL, suggesting a lure to trick users into clicking. The ML classifier also strongly indicated maliciousness.

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://ggtraff.ru/pify?keyword=learning+to+read+kindergarten+pdf In PDF document text
    • https://site-1042286.mozfiles.com/files/1042286/75196127240.pdfIn PDF document text
    • https://site-1043335.mozfiles.com/files/1043335/zujelidiwu.pdfIn PDF document text
    • https://site-1039496.mozfiles.com/files/1039496/patuf.pdfIn PDF document text
    • https://site-1036791.mozfiles.com/files/1036791/miripewazojuwigalu.pdfIn PDF document text
    • https://site-1043257.mozfiles.com/files/1043257/misori.pdfIn PDF document text
    • https://site-1038477.mozfiles.com/files/1038477/xajomujela.pdfIn PDF document text
    • http://folad.auroraindustrial.co.uk/uploads/1/3/0/8/130813934/naxovaguwadifumufin.pdfIn PDF document text
    • http://jigimijem.words2pix.com/uploads/1/3/1/4/131407395/mepezaj.pdfIn PDF document text
    • http://files.solsticemoons.com/uploads/1/3/0/7/130776688/9063256.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6121/4877/files/fodoviregonex.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_off000085ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85FF 4792 bytes
SHA-256: 7e4dfaae987e5eeb3cec3b1732a83eca6bc733c9f48ea1923738e8a20d2dc0bc
font_01_sfnt_off0000965a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x965A 10484 bytes
SHA-256: ba1b279e974b99674cb06e8c1d3ebd639af23c145d6df6afdf224758db7a4b1e
font_02_sfnt_off0000b9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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