Malicious PDF — malware analysis report

Static analysis result for SHA-256 d590dde45f285698…

MALICIOUS

PDF

41.0 KB Created: 2020-08-29 18:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10f483ade2591f8398266505fc64d13f SHA-1: 233f60ebe98b2cebefea618150a8ebe0642aae1d SHA-256: d590dde45f285698c065b4c808469007786fb47172cc0d1bc3de06c39dc6126f
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector, disguised as a criminal record certificate. The ML classifier strongly indicated maliciousness. The primary attack vector is likely social engineering via the lure of official documentation, leading to the malicious redirector.

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/wix?keyword=certificado+de+antecedentes+penales
    • https://cdn.shopify.com/s/files/1/0431/4500/3169/files/41181565924.pdf
    • https://cdn.shopify.com/s/files/1/0430/8644/6746/files/centrifugal_pump_lab_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xarapidarobumebavo.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7453fe166aa421cb9a6576793c7d090.pdf
    • https://static.usrfiles.com/ugd/b8c837_04eb9e0fcc4344748837390be136e3eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_e32663d164b94940a19c6eeb3fa24506.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a164e274e074c4691f89bf68ad0e054.pdf
    • https://cdn.shopify.com/s/files/1/0432/8328/4132/files/fiszki_obrazkowe_angielski_dla_dziec.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/26128537625.pdf
    • https://cdn.shopify.com/s/files/1/0437/4573/8903/files/kitchenaid_pasta_cookbook.pdf
    • https://cdn.shopify.com/s/files/1/0435/1049/7434/files/john_deere_400_garden_tractor.pdf
    • https://cdn.shopify.com/s/files/1/0460/5752/1307/files/roseville_college_junior_school_uniform.pdf
    • https://static.usrfiles.com/ugd/b8c837_a96ba4d53c5d49dcb42b83e3e8453bac.pdf
    • https://static.usrfiles.com/ugd/b8c837_ea3742cd8f644fc99f78fa4b15bf0c61.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_off00006058.bin
51c0c71fdaf99a16f9c37d4631e448dfa98f2a4bfe31f51f68cfe5cdd18b1380
pdf-font-stream PDF embedded font (sfnt) at offset 0x6058 5052 bytes
font_01_sfnt_off0000718f.bin
99a77ae066cc8590c693a760c1bc94dac621deb62dfdaada3213e7cdb3fc7fbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x718F 11040 bytes