Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdcc852e6c5876da…

MALICIOUS

PDF

41.8 KB Created: 2020-09-01 14:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 161eef1691ea179365f1e755d6647340 SHA-1: c11257ac86333d4222cfb562cd4f1fd113fd1700 SHA-256: bdcc852e6c5876da74a059a4f2ad809207d1c28332756f57ec457ded6044c707
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to PDF files hosted on Shopify. One of these links, 'https://ttraff.club/pify?keyword=plural+form+of+bacteria', is identified as a malicious redirector. This suggests the document is part of a link farm designed to lure users to malicious content. The ML classifier also strongly indicated maliciousness.

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.club/pify?keyword=plural+form+of+bacteria
    • https://cdn.shopify.com/s/files/1/0435/9123/7791/files/capteur_de_vitesse_principe_de_fonctionnement.pdf
    • https://cdn.shopify.com/s/files/1/0437/8080/0674/files/1st_year_biology_book_download_sindh_board.pdf
    • https://cdn.shopify.com/s/files/1/0431/3343/6055/files/capites_da_areia.pdf
    • https://cdn.shopify.com/s/files/1/0437/0874/3834/files/pkjfu3kl7-_mebzxrsvsjrg_oj3fm6jj9ve7mm_0__null.pdf
    • https://cdn.shopify.com/s/files/1/0432/8374/2884/files/togof.pdf
    • https://cdn.shopify.com/s/files/1/0443/5968/0156/files/53289383686.pdf
    • https://cdn.shopify.com/s/files/1/0429/3158/5180/files/laughing_businessman_meme_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/0806/4677/files/physical_science_grade_10_siyavula_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/1507/7022/files/criminal_1995_songs_ming.pdf
    • https://cdn.shopify.com/s/files/1/0435/9146/7176/files/50292973202.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/tipos_de_sistemas_organizacionales.pdf
    • https://cdn.shopify.com/s/files/1/0431/5892/9570/files/nickel_cadmium_battery_advantages_and_disadvantages.pdf
    • https://cdn.shopify.com/s/files/1/0435/5666/7541/files/30510174476.pdf
    • https://cdn.shopify.com/s/files/1/0429/9227/1519/files/meeting_invite_template_sample.pdf
    • https://cdn.shopify.com/s/files/1/0431/2779/9957/files/definicion_de_analisis_financiero.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0106/files/zobigebiguf.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_off00005f7e.bin
a0d71d1da90c4c5f87494a78cc0dbc5253ad0191c24c99391009060901c20f95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7E 4988 bytes
font_01_sfnt_off00007067.bin
a3c29c9077cf0efccb219feaa0fc8b1a8a2c9f40388f726609f7c1e0b4c9902d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7067 12704 bytes

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