Malicious PDF — malware analysis report

Static analysis result for SHA-256 9705c7e6aa3a9522…

MALICIOUS

PDF

72.2 KB Created: 2020-08-29 15:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39adc6383606c58c56ece7212ef1a438 SHA-1: f7dc9bae620589d0f65fb725f775635f1895cefb SHA-256: 9705c7e6aa3a952287605964b985b7b241ecf29c70752b4152531724dc6edd6f
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to malicious sites through a link farm, likely for phishing or malware distribution.

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.ru/wix?keyword=%25D8%25A3%25D9%2581%25D8%25B6%25D9%2584+20+%25D9%2581%25D9%258A%25D9%2584%25D9%2585+%25D8%25B9%25D9%2584%25D9%2589+%25D9%2586%25D9%258A%25D8%25AA%25D9%2581%25D9%2584%25D9%258A%25D9%2583%25D8%25B3
    • https://cdn.shopify.com/s/files/1/0434/3991/5164/files/92148778445.pdf
    • https://cdn.shopify.com/s/files/1/0433/8145/7061/files/41137248790.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6472/files/practica_de_enlaces_quimicos.pdf
    • https://cdn.shopify.com/s/files/1/0431/3723/7148/files/volizuw.pdf
    • https://cdn.shopify.com/s/files/1/0435/2373/5720/files/argentina_online_visa_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/2411/4076/files/summertime_sadness_chords.pdf
    • https://cdn.shopify.com/s/files/1/0430/3264/1689/files/xazavuvisezizoromutonadis.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd27f96660aa42948bf6d071bee223fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_176043b66a5943edb306487a38132a78.pdf
    • https://static.usrfiles.com/ugd/b8c837_02deec101a184540a72652b7e16f61c5.pdf
    • https://cdn.shopify.com/s/files/1/0435/2924/0727/files/dusubamixapowejuze.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8584587797.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000cace.bin
dcdb771896561374a5a9f29056998f7705444e0b6636f22430c84ef4aba8e839		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCACE 32120 bytes
font_00_sfnt_off000084d4.bin
522455a0a954a3b7812bcb491cd4d26f43fdb1bc982414ee3658123b099324d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84D4 3668 bytes
font_01_sfnt_off000090ff.bin
2a613807f56743ce771da5e8ab9e14751723bd63b47bf0906e204809a6761c3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90FF 17964 bytes
font_02_sfnt_off0000aca2.bin
b91dc24f28ddf3d44f04be5963200d0734abe974f4990852521f11f74c2d77e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACA2 8748 bytes
font_04_sfnt_off00010270.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10270 4324 bytes

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