Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb2cb81339a8d2ae…

MALICIOUS

PDF

53.8 KB Created: 2020-08-07 09:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7f766bc7b73cf6351a0d1e353b3a452 SHA-1: 3542ef6f035e0dafd4a5a4f639b1ca37c09d5c60 SHA-256: eb2cb81339a8d2ae612e606f19846f0ee0b66fd2b3a6d020004f8662d6050f27
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a French spelling book PDF. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link indicates an attempt to lead the user to a harmful site.

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=livre+d+orthographe+fran%25C3%25A7ais+pdf
    • http://files.burkebros-cheltenham.co.uk/uploads/1/3/0/7/130738940/zerutebupinexidif.pdf
    • http://files.guidetoamericasparks.com/uploads/1/3/2/7/132740965/0d4c34.pdf
    • http://files.rebeccagrayyoga.com/uploads/1/3/1/4/131406827/bebezamakosa.pdf
    • http://files.megansbakeshop.com/uploads/1/3/1/4/131407704/lewuvolitive-gewaku-fodojuzeluko-kidot.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/zabepusuxavivojanemaxu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2859/4344/files/kaxilifunavovefu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9427/8293/files/vuzuwijaditefenetupowez.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/75686433604.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/17570598595.pdf
    • https://cdn.shopify.com/s/files/1/0428/8777/4374/files/5284727192.pdf
    • https://cdn.shopify.com/s/files/1/0436/7797/4678/files/61673383511.pdf
    • https://cdn.shopify.com/s/files/1/0435/8003/1135/files/wegonebokobojifiw.pdf
    • https://cdn.shopify.com/s/files/1/0434/9159/0308/files/biblia_de_estudio_explicada_reina_valera_1960.pdf
    • https://cdn.shopify.com/s/files/1/0428/1984/6311/files/xudajazodez.pdf
    • https://cdn.shopify.com/s/files/1/0438/9876/5480/files/15047429082.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/free_acrobat_reader_for_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0431/5044/2652/files/bavopirunexokuto.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_off00008d60.bin
14d3f4dbcbc80feb5fdaa2a128dad3831e79c4ed7d937de59ef4186c1017f0c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D60 5456 bytes
font_01_sfnt_off00009ff8.bin
f22986a3fba0374d22f2c36549478571d4217caa4ae1119f6ff6218ac19f30a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FF8 12864 bytes

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