Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bdbec75cf43c42f…

MALICIOUS

PDF

72.6 KB Created: 2020-08-08 02:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cca1dc83c1e27e1afa625fb0d7015ff SHA-1: 3397e1f8371ec983ab11a0df91b1093c55a901d1 SHA-256: 7bdbec75cf43c42fe9c6fb91ae37d84cb1980e50b33a380a158dcb94233f4c9d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=livro+argumenta%25C3%25A7%25C3%25A3o+pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to improve search engine visibility for the malicious content. No scripts were extracted from this sample.

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=livro+argumenta%25C3%25A7%25C3%25A3o+pdf
    • http://vuworo.rufcreativefashion.net/uploads/1/3/2/6/132681352/fivuwum-fagubew-puxoworoz.pdf
    • http://files.raynalong.com/uploads/1/3/1/3/131384281/sibafozafu_ruxapak.pdf
    • http://files.whispergathering.com/uploads/1/3/1/8/131856039/9311032.pdf
    • http://files.twoforestplaza-leasing.com/uploads/1/3/0/8/130874680/tikozanefogabon_jemit_jabelumolu_nuvukijadini.pdf
    • http://files.thefilamentstudio.com/uploads/1/3/1/6/131606035/fakesijerisaz.pdf
    • https://cdn.shopify.com/s/files/1/0435/9625/1304/files/58057916443.pdf
    • https://cdn.shopify.com/s/files/1/0429/5213/0716/files/28573375167.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/naxarasorinu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0409/9735/files/pdf_file_download_for_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0431/9323/7665/files/ditarupapomuvenemuguro.pdf
    • https://cdn.shopify.com/s/files/1/0434/9588/2918/files/glittering_generalities_example.pdf
    • https://cdn.shopify.com/s/files/1/0434/2897/0647/files/aithihyamala_part_8.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87960197539.pdf
    • https://cdn.shopify.com/s/files/1/0434/5384/1560/files/classic_wow_pet_attack_macro.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/novorubafiwani.pdf
    • https://cdn.shopify.com/s/files/1/0432/7797/5717/files/wowojumurasunusagavefoten.pdf
    • https://cdn.shopify.com/s/files/1/0434/1219/3438/files/detaxorazaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/7064/4631/files/58193266465.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da29.bin
026c9d874b1632215f782da2451f99393c327e7595ef49c231160d1facb5d374		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA29 5652 bytes
font_01_sfnt_off0000eccd.bin
9bbe3b22b7bcdd0c463ccf0d99755db524f4c1aca2d76dd3c9e844c43261ef8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECCD 12892 bytes

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