Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e59e6f297a61a0…

MALICIOUS

PDF

64.4 KB Created: 2020-08-29 05:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d144e6f855d40c43b3d52d50c56ebd5f SHA-1: 8c64a789ac6749a44cf18800578870bedc0f6dc6 SHA-256: a0e59e6f297a61a052fde11108f2ae589b1c3ec7bf95c9dd2561a0dcca36a885
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on 'static.usrfiles.com'. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be luring the user to a malicious site via the embedded link.

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=temple+of+the+ascending+flame
    • https://static.usrfiles.com/ugd/b8c837_d628ed0e895649dd89fe66bc85ae17fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc315ba13a37423eb33f7e721aefa94c.pdf
    • https://static.usrfiles.com/ugd/b8c837_66e04090aa0b4d32b50ab3a6a798f051.pdf
    • https://static.usrfiles.com/ugd/b8c837_7972b5d6619d4302a748b76661e89acd.pdf
    • https://cdn.shopify.com/s/files/1/0434/8857/5638/files/85446418668.pdf
    • https://cdn.shopify.com/s/files/1/0432/4855/0050/files/diledizulibafuxita.pdf
    • https://cdn.shopify.com/s/files/1/0434/4869/6993/files/future_mixtape_download.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd7f959713c04472ba243d38c7b5edcd.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d62489b3fa74423a75f6d633721e90f.pdf
    • https://static.usrfiles.com/ugd/b8c837_71be042c184646ac8824a5897df6df64.pdf
    • https://static.usrfiles.com/ugd/b8c837_38708ea07c0845c2a202dda7ae14a2e3.pdf
    • https://static.usrfiles.com/ugd/b8c837_754ced4bcdab4c66beec1b757df86c15.pdf
    • https://static.usrfiles.com/ugd/b8c837_db5137a3c7904d6e862e689d545f7115.pdf
    • https://static.usrfiles.com/ugd/b8c837_50fe4327597e40628b8655c4b0f2605b.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d30eb72c1cd403f8d412663ef2052de.pdf
    • https://static.usrfiles.com/ugd/b8c837_9103ccc0c81647c68040e4b2ae5c9f27.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1c6.bin
c6e2e96ae0a8879ab85bfcd901d47f680498348bdbdf01a9d40779c81c75f754		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C6 5212 bytes
font_01_sfnt_off0000c35a.bin
42d847b63dab7c39648043c549f981336aebc3c653d1a7d930fda2a5185df8e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC35A 10172 bytes
font_02_sfnt_off0000e624.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE624 4324 bytes

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