Malicious PDF — malware analysis report

Static analysis result for SHA-256 14d6d88f99f78551…

MALICIOUS

PDF

47.3 KB Created: 2020-08-31 19:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10dc061891eb285ff39e37f859c0d2c7 SHA-1: 90ed88628a3811f69021cec4e660a579527fd282 SHA-256: 14d6d88f99f7855104994d569b34f74d19428f75030fdffa992fc4718539fb5d
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to a link farm, and one specifically to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'watermark remover' and a URL that matches the malicious redirector. The presence of a 'download button' heuristic further supports the lure tactic. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to drive traffic to malicious sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=watermark+remover+from+pdf+software
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/7baf93_23a3e4deb6704bc3a182e137b83b7f7f.pdf
    • https://static.usrfiles.com/ugd/0b46e6_46a815c9874b4fabb759f8c4a8c2e020.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4ad87bbb5ac45b1b7a6d1efa8027d16.pdf
    • https://static.usrfiles.com/ugd/a382ee_1814306cbee04ffdb4dc2e109be7bdd3.pdf
    • https://static.usrfiles.com/ugd/b8c837_7bc36a9f5104486ca7fc52d0f3f10884.pdf
    • https://static.usrfiles.com/ugd/7d21c0_3696fff27d8d41c69a32975bee91b73c.pdf
    • https://static.usrfiles.com/ugd/b8c837_e62dca9eb4164cc580e4e8856dd25dcd.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a84e3cf8b1843ffa0db26a71b05c1a8.pdf
    • https://static.usrfiles.com/ugd/4bb894_3909a1091a2d4703997eedfae65ecac4.pdf
    • https://static.usrfiles.com/ugd/913720_9ea2b046ce4a4af5aaed01686e35a9a7.pdf
    • https://static.usrfiles.com/ugd/105a8c_1dca15b5581e4f3b9d625d614626fb82.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6964/files/pupusoriponolaziv.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/zubugilegapes.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6068/files/tatarodexe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72905654063.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ab0.bin
d1f291aade32abc4ef876b72e026f8044ef784e1762b0e05fbf93a7104a7fcac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB0 5384 bytes
font_01_sfnt_off00008d0b.bin
518c633c9fd620ef5b6b7410cfc277e6b537c930416ec8d557a3c8a8120a9b06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D0B 10304 bytes

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