Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce27db70a3d0dbed…

MALICIOUS

PDF

35.3 KB Created: 2020-08-25 00:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 391690a89e65bc6117456a81cb6ebfa0 SHA-1: f9f688b5df086f42e6bf9161250a7ad65e6178fa SHA-256: ce27db70a3d0dbed109725e055708f4cce4d91b4a0b9c58ec8a81f4ba7280b72
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with 30 links identified as part of a link farm. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure via the URL https://ttraff.ru/pify. The ML classifier also strongly flagged this PDF as malicious. The embedded links likely serve to direct users to malicious sites, potentially for phishing or to exploit SEO vulnerabilities.

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=basalt+slate+formica+countertops
    • http://gofunilo.aliciapettit.com/uploads/1/3/0/7/130775413/kimokamokilop.pdf
    • http://files.foxwoodarabians.net/uploads/1/3/1/6/131637135/3bca9a7e6bcf6.pdf
    • http://zinupud.ackertech.org/uploads/1/3/1/4/131406947/lukagokubokix-kotud-xubasefiteruz.pdf
    • https://cdn.shopify.com/s/files/1/0434/2261/3655/files/boboiboy_galaxy_run_mod_apk_apptoko.pdf
    • https://cdn.shopify.com/s/files/1/0436/0319/8116/files/28129648032.pdf
    • https://cdn.shopify.com/s/files/1/0427/6345/2583/files/ireport_not_opening_ubuntu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3318/2886/files/jerusalem_bible_online.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/kiwisaver_first_home_buyers_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/0132/3420/files/voroforedavo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3343/6071/files/vadabadi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9572/files/top_linen_bed_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0445/3564/4319/files/research_paper_about_cosmetics.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/soxevebusutiviladefa.pdf
    • https://cdn.shopify.com/s/files/1/0427/9199/3500/files/burifapokowazu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7967/1718/files/jukakozumatavesoxa.pdf
    • https://cdn.shopify.com/s/files/1/0430/9359/0167/files/tajadakajotilimuvo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3177/3852/files/sawuzaz.pdf
    • https://cdn.shopify.com/s/files/1/0436/0405/0084/files/hematopoietic_stem_cells.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_off00004c97.bin
af760a9a8062de8ce35f5df1634a015f202c615813fd9111d7826289df4757b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C97 5212 bytes
font_01_sfnt_off00005e3b.bin
776f6e6e1fb72645e5e75298a5dee5f4e9c0e8430ea987f8e4464dfc0cde98a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3B 9868 bytes

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