Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f4cc5dad16d26d…

MALICIOUS

PDF

45.6 KB Created: 2020-08-23 00:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb53b23d6075a0256a45c8b5156574ed SHA-1: ca4c075b16d2dd39c8c0d8c870babfdb35c3dbcb SHA-256: e3f4cc5dad16d26dab31fb9affb3dd2e2d4c68d6e80f4597301f352f6e5ca40f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic indicates the PDF links to known malicious redirector infrastructure via 'https://ttraff.com/pify?keyword=formal+letter+asking+for+information+sample'. Another critical heuristic identified a PDF link farm, with many links pointing to Shopify domains, suggesting an attempt to obscure the true destination or leverage legitimate platforms for distribution. The document body contains garbled text but also includes the redirector URL and several Shopify PDF links.

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=formal+letter+asking+for+information+sample
    • http://files.boerneamlegion.org/uploads/1/3/1/3/131381363/kuwenuwemurotareti.pdf
    • http://xukovivi.bantrybayponytrekking.com/uploads/1/3/2/7/132740373/dunawefuzu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3215/8116/files/84428470804.pdf
    • https://cdn.shopify.com/s/files/1/0435/5063/8229/files/alaska_air_route_map.pdf
    • https://cdn.shopify.com/s/files/1/0432/0378/8959/files/autoestima_y_autoconcepto_en_adolescentes.pdf
    • https://cdn.shopify.com/s/files/1/0428/4124/3814/files/autobiographical_narrative.pdf
    • https://cdn.shopify.com/s/files/1/0434/4017/7308/files/bible_new_king_james_version.pdf
    • https://cdn.shopify.com/s/files/1/0432/1283/2931/files/22331515642.pdf
    • https://cdn.shopify.com/s/files/1/0435/7043/0115/files/binary_options_trading_strategies_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6686/7362/files/jolokugefifezogar.pdf
    • https://cdn.shopify.com/s/files/1/0435/1138/2170/files/maths_addition_worksheets_for_class_6.pdf
    • https://cdn.shopify.com/s/files/1/0430/0813/1233/files/balance_sheet_format.pdf
    • https://cdn.shopify.com/s/files/1/0432/5516/9186/files/vopuduburebuvimib.pdf
    • https://cdn.shopify.com/s/files/1/0433/0923/6374/files/87472406751.pdf
    • https://cdn.shopify.com/s/files/1/0439/1777/0904/files/gafogivejerufaxotof.pdf
    • https://cdn.shopify.com/s/files/1/0439/1400/2587/files/19356817257.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_off000066d1.bin
05412cfc95ec6df2b3e76ef5aa73af8fdd6a63d16083fdca9c31eb5cc5b9cfa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66D1 5028 bytes
font_01_sfnt_off000077ce.bin
6acdaf8399eac319150d0567f7f348c3c19c5318766dc9dc5ffb286bc653a26b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77CE 10292 bytes
font_02_sfnt_off00009af4.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AF4 4324 bytes

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