Malicious PDF — malware analysis report

Static analysis result for SHA-256 8613a8b0b7c0ab82…

MALICIOUS

PDF

39.9 KB Created: 2020-08-30 22:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21d274181ca875ce8ef0dfa9ecaa1e01 SHA-1: 01d32aa4f25212a63833df03510fb0b842269abe SHA-256: 8613a8b0b7c0ab8260626ab4458cd736b39b6a25461733c32d2fa5bd519871c4
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a lure instructing the user to copy and paste content into a shell context, which is a common technique for executing malicious commands. It also links to known malicious redirector infrastructure, suggesting an attempt to download further malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.com/wix?keyword=fix+kernel32.dll+kostenlos
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_82510f476aff418780b6dab1ffc9593e.pdf
    • https://static.usrfiles.com/ugd/b8c837_2cc151931659490da406f5a076073cb9.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb351efe6639463983164d0d75870432.pdf
    • https://static.usrfiles.com/ugd/b56239_04b73b6e11e34c46af81efa3fb4fdca5.pdf
    • https://static.usrfiles.com/ugd/e3834b_a898042f1174441da4b3316ebefbf5d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_428b077b14644b6ab0bd1aaf80daee26.pdf
    • https://static.usrfiles.com/ugd/45e30f_a3229daa2a404aceaece8a5ea8844755.pdf
    • https://static.usrfiles.com/ugd/b8c837_f68ba551c4664203a2ecacec1817c8da.pdf
    • https://static.usrfiles.com/ugd/162fe6_22cf5585430746a281ea39ec5ea66bad.pdf
    • https://static.usrfiles.com/ugd/72216b_ee8bd0d61e254d64adb85ba0342a0fea.pdf
    • https://static.usrfiles.com/ugd/6df952_1340e63cb00c43bdb8906dce21f0306d.pdf
    • https://static.usrfiles.com/ugd/de60da_327be4a45df245dd8fecffd3a16c41d9.pdf
    • https://static.usrfiles.com/ugd/a467d2_cad0675e45034b61b57406764aa3b4e4.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/free_background_funny_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/7115/2023/files/26203986431.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_off00005e44.bin
4006993ecd29806e5a5200b5e9440c2ab8dd7c52675861d00f8470248af4d408		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E44 5024 bytes
font_01_sfnt_off00006f6b.bin
c816d5003ac1c1eb114ad200f6e6102d57b05732164376d22f45bafb8ff6095d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6B 10280 bytes

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