Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f99454b1113df94…

MALICIOUS

PDF

34.0 KB Created: 2020-08-06 15:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdec2e834d27cf87222dd35ca06c472d SHA-1: 0e8158a9c3dd5321c36761f40fac3e714bc0804e SHA-256: 6f99454b1113df94f2d5c4dbf8023ee6be354a2f34c817420f19f9d104c533c1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to a worksheet, likely a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious activity.

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.com/pify?keyword=third+person+singular+verbs+worksheet+pdf
    • http://files.flowersbyjennycrafter.com/uploads/1/3/1/4/131452741/mugeso_futagenerep_dagokunijux.pdf
    • http://files.asteadyhandfoundation.org/uploads/1/3/2/7/132740552/lizepuvofusa.pdf
    • http://files.thespeculativekitchen.com/uploads/1/3/1/4/131483154/fe9e5f58608.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kujefitil.pdf
    • https://cdn.shopify.com/s/files/1/0428/1961/6935/files/90791928970.pdf
    • https://cdn.shopify.com/s/files/1/0438/4745/0789/files/61232262307.pdf
    • https://cdn.shopify.com/s/files/1/0432/2299/1007/files/graduation_announcements_wording.pdf
    • https://cdn.shopify.com/s/files/1/0437/5638/8510/files/jokemukafogusivenifiji.pdf
    • https://cdn.shopify.com/s/files/1/0434/8598/6982/files/benchmarking_journal_articles.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupesuditijativerawepafu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/kikikajokejozipananafiv.pdf
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/wapasagowepe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0412/4571/files/79747605391.pdf
    • https://cdn.shopify.com/s/files/1/0429/5717/6986/files/qasa_ul_anbiya_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/datumaf.pdf
    • https://cdn.shopify.com/s/files/1/0435/0718/7872/files/amit_goswami_el_universo_autoconsciente.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004554.bin
55a0d8dee0053363d39def8aefa455793b9a34a147d68a7fcd0ad073875c6961		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4554 5608 bytes
font_01_sfnt_off00005872.bin
a8abf3e124d581e938fcacca11912fdce65c2dba5e46e4681a4d1b07c3c1ef07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5872 10212 bytes

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