Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb22eb90c09378d…

MALICIOUS

PDF

118.9 KB Created: 2020-08-22 13:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eeaaccc751f4c5456830605561bd4e82 SHA-1: a146d24aa120b8189a478ab9da8da0de123e8e3c SHA-256: abb22eb90c09378db7d57ea5efd0653be1e92da5219748e1e8a3ae5ce727ff67
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=dyslipidemia+guidelines+2019+aha'. Additionally, it features a PDF link farm heuristic, indicating a large number of external links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirect URL, reinforcing the malicious intent.

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=dyslipidemia+guidelines+2019+aha
    • http://files.stephcookpt.com/uploads/1/3/2/6/132681993/munitowekorara.pdf
    • http://files.rogerhorowitz.com/uploads/1/3/1/1/131164174/lonuzoliwavajusew.pdf
    • https://cdn.shopify.com/s/files/1/0432/6742/4412/files/90765519511.pdf
    • https://cdn.shopify.com/s/files/1/0434/6016/5797/files/962_country_code.pdf
    • https://cdn.shopify.com/s/files/1/0432/4501/1112/files/jamawe.pdf
    • https://cdn.shopify.com/s/files/1/0429/3731/9590/files/14978702315.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5311/files/print_and_play_board_games.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9807/files/moxadagopakujojuvo.pdf
    • https://cdn.shopify.com/s/files/1/0428/6870/3398/files/japanese_to_english_translation_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/2247/3624/files/caballo_de_troya_9_cana_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0444/1725/3542/files/descargar_revista_casa_viva.pdf
    • https://cdn.shopify.com/s/files/1/0436/8020/2905/files/the_connected_discourses_of_the_buddha_bhikkhu_bodhi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/kakaluvapesupisi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5682/files/architecture_residential_drafting_and_design.pdf
    • https://cdn.shopify.com/s/files/1/0435/3271/4139/files/97849063551.pdf
    • https://cdn.shopify.com/s/files/1/0431/4441/3341/files/29022470104.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/xawirofagapeziwukut.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_off0001897f.bin
634d0bac9b19777ea2b310e758fbf3de5ec3c31f06f7eddca0ce1eb56c182172		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1897F 5860 bytes
font_01_sfnt_off00019d59.bin
342f74557b8a26f7342930220a11d264ef4f27b315e0bc07730482c69baada65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19D59 15496 bytes

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