Malicious PDF — malware analysis report

Static analysis result for SHA-256 373b95d734c0926b…

MALICIOUS

PDF

44.6 KB Created: 2020-08-06 16:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d56bfbd882650324cb6d24e527235e2 SHA-1: 239acd34f787a7f5eee7f0aa97db253c5275b29d SHA-256: 373b95d734c0926be215f3858107a18cc05bac60ade3423dcc7d20e989792bfe
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to PDF conversion tools and also includes the malicious URL. The presence of a link farm suggests an attempt to manipulate search engine results or lure users through deceptive content. 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 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.
  • 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://ttraff.ru/pify?keyword=able2extract+pdf+to+excel+converter
    • http://gevulafid.discoveringtogether.ca/uploads/1/3/1/3/131379362/3282148.pdf
    • http://files.centralpalgbthistory.org/uploads/1/3/1/8/131857723/f3df34cebb41.pdf
    • http://files.oneplanetsaanich.org/uploads/1/3/0/9/130969754/wobuxoril.pdf
    • http://vanow.shadesofartistry.com/uploads/1/3/1/8/131871674/kinil-towowoniropeko-buzatolinasuwed-lidagavezami.pdf
    • https://cdn.shopify.com/s/files/1/0440/8007/0821/files/likojulowazizagi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7204/4697/files/tunnelbear_for_kodi.pdf
    • https://cdn.shopify.com/s/files/1/0433/2647/2345/files/pipefitter_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/7065/1542/files/pojusomerevuweb.pdf
    • https://cdn.shopify.com/s/files/1/0435/3366/4420/files/fovajas.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/pirurede.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/sekowukofo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5956/0086/files/gusanaxoxiraginanake.pdf
    • https://cdn.shopify.com/s/files/1/0430/7301/1865/files/19861631635.pdf
    • https://cdn.shopify.com/s/files/1/0431/5080/3099/files/21622035700.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28391359898.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/dilations_practice_worksheet.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005def.bin
11abf7992bc1c23d6e061d7b0b0a7caee89784edc44c99e01a932a1b8396d078		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEF 5100 bytes
font_01_sfnt_off00006f54.bin
3b788e444d4f54177360f33145143da5a607c554013ce2f23c511ea090ad9456		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F54 12424 bytes
font_02_sfnt_off0000974d.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x974D 4324 bytes

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