Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efe1af4f8397992…

MALICIOUS

PDF

46.7 KB Created: 2020-08-19 15:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11b175d4d67bb5e89ebcf64b89f954be SHA-1: 06eddb3cd77f4e07ace7e0b80352a834a4e5a81b SHA-256: 8efe1af4f839799205b1ad75399f1ec6a4399bc86fa90842e7700248bbb3fb90
152 Risk Score

Malware Insights

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

The PDF file masquerades as a product spec sheet to trick users into clicking a malicious link. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms that the embedded URL leads to known malicious redirector infrastructure. The ML classifier also strongly indicates maliciousness. The document body contains garbled text but includes the target URL and a benign-looking PDF URL.

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=konica+minolta+bizhub+363+spec+sheet
    • http://jikitir.apexmiddleschoolpta.com/uploads/1/3/1/6/131606349/nogejisak-ladajepi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dovaxetudomorunuk.pdf
    • https://cdn.shopify.com/s/files/1/0437/4292/0869/files/rf_to_eu_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0436/7987/5225/files/building_planning_and_drawing_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/0998/1085/files/77181533477.pdf
    • https://cdn.shopify.com/s/files/1/0433/6055/1070/files/manumutusolosikotenadiw.pdf
    • https://cdn.shopify.com/s/files/1/0438/5194/0000/files/vidomepeziwamabar.pdf
    • https://cdn.shopify.com/s/files/1/0435/3458/1911/files/animedroid_apk_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0432/0319/9138/files/moziwa.pdf
    • https://cdn.shopify.com/s/files/1/0428/2767/7852/files/47133614365.pdf
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/sezabufanetavagopanagere.pdf
    • https://cdn.shopify.com/s/files/1/0440/9622/5432/files/canon_mp210_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/2932/3158/files/4850416352.pdf
    • https://cdn.shopify.com/s/files/1/0440/5808/3493/files/kotor_tsl_patcher.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_off00006b1b.bin
73dc456240019270460e9ddec75550bd673b96232a994114a0fcb577a7f391d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B1B 5552 bytes
font_01_sfnt_off00007dd3.bin
e6907c42013206284236f555334cc034eea296d2ffd8454c446ffa4abd7997ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD3 14808 bytes