Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d67ca94db8117d8…

MALICIOUS

PDF

36.9 KB Created: 2020-09-18 07:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e214e946035ea4a581b24ec0eea9789b SHA-1: 6da1c5552d357923559e172f7257738d9ac3b3e3 SHA-256: 0d67ca94db8117d8fa3f8736c6e4dd192fee879ef8e52bcb0749ecab6f6295fc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to suspicious or potentially malicious redirector domains. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of links to known malicious infrastructure. The document body, though obfuscated, contains URLs that are consistent with a link farm or phishing lure.

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.link/wix?keyword=ap+biology+standard+deviation+practice+worksheet+answers
    • http://ximines.learningexchanges.org/uploads/1/3/0/7/130775565/9604509.pdf
    • http://files.melissa-haskin.com/uploads/1/3/0/8/130814591/nonagesazuviso.pdf
    • http://gemulif.sacredmusicpublishing.com/uploads/1/3/1/4/131409310/e31fbfbc6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cb2f2529-5529-4bea-85af-de20ad7d0e64.filesusr.com/ugd/5de1df_e6682506e3d046df85e882082db33777.pdf?index=true
    • https://a884e26c-da25-4a35-99f8-edc3e9eb96f8.filesusr.com/ugd/221eaa_96a3972585ea4327bdbd7e84cbbaaeb1.pdf?index=true
    • https://b94e46ee-6d3e-4c21-9586-836e33559a18.filesusr.com/ugd/7a7fb1_f46332a2bd394dd6b9f57ba6b193a655.pdf?index=true
    • https://75c30be6-ec5f-4d74-8895-7e11a7054ade.filesusr.com/ugd/162fe6_0cb45a8990d444ea98e7b969e741253a.pdf?index=true
    • https://98a6b12a-6454-4275-a698-81446cb79dc2.filesusr.com/ugd/a891c0_a838acb6af4f49d2a1070bd1040c29ad.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/7675/5349/files/geometric_figures.pdf
    • https://cdn.shopify.com/s/files/1/0432/5870/8118/files/25295788151.pdf
    • https://cdn.shopify.com/s/files/1/0431/9635/0626/files/hpu_admit_card_entrance.pdf
    • https://cdn.shopify.com/s/files/1/0431/4647/7722/files/calendar_2020_malaysia_printable.pdf
    • https://cdn.shopify.com/s/files/1/0428/3485/4051/files/rogonidesetaxud.pdf
    • https://6f1dcc7f-ac06-4b63-9253-88edeec6e81e.filesusr.com/ugd/3be48b_f5fc394af1284cf9a2d1268c24805efd.pdf?index=true
    • https://6a663176-9a1c-44ae-b875-976a43145ced.filesusr.com/ugd/49488e_ac7bae4909984cee83a30d5c45fa2ed9.pdf?index=true
    • https://8b3a328d-9c5b-411e-815e-c559b161cc75.filesusr.com/ugd/1be480_b5624da2a8a74b9f95d4d0265be565a9.pdf?index=true
    • https://e785693c-1fe8-413a-8bb1-0e288f86fd9c.filesusr.com/ugd/badafb_4157b110e7a64b70b1edfe0944215405.pdf?index=true
    • https://6dc24445-d8b7-44c8-a61e-0a256bf4bb49.filesusr.com/ugd/aaaf79_e139c5ea1aa44e2b929bf203f474b2df.pdf?index=true
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000513c.bin
148f057f708139f560769867e16ca6753e19af73b6c41216e6d77e8a8fd953bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x513C 5784 bytes
font_01_sfnt_off00006500.bin
a35f1b1d164b81b7e7e80aa39c61a747ea001f4f217f397c0dcde84e9d8a3794		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6500 9752 bytes

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