Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc91c998a9de091…

MALICIOUS

PDF

46.5 KB Created: 2020-09-11 19:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a65d0d09bf7ca23580544d9a97e340a SHA-1: b764c7eb6bfa93ca68b118c86397a083d86db015 SHA-256: 9cc91c998a9de091c3d71855d56a270f02b8960d1caf2b650623679e2551a8ab
160 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link and a link farm, indicating a social engineering attempt. The document body, though heavily obfuscated, contains a URL that aligns with the 'Browser extension / update installation lure' heuristic. This suggests the primary goal is to trick the user into clicking a link that leads to the download or installation of malicious software, potentially disguised as a browser update.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.link/wix?keyword=browser+apk+latest+version
    • http://gowefib.thorsonpto.org/uploads/1/3/2/6/132696067/9dc36ecc91.pdf
    • http://files.benjaminyeo.com/uploads/1/3/1/4/131438397/06aebc5ef71c.pdf
    • http://files.pgeastteachandlearn.com/uploads/1/3/0/7/130776049/xeditax_bimunejukijumip_ralevuful_zofuniluwirege.pdf
    • http://files.12amphotography.com/uploads/1/3/0/7/130739742/886146.pdf
    • https://static.usrfiles.com/ugd/097bd5_5814f6feb24f47058506216a162dea4e.pdf
    • https://static.usrfiles.com/ugd/314c35_00b12fa1115c4b3497e7b92c1855dee7.pdf
    • https://static.usrfiles.com/ugd/0f1814_4b6d44ccb20940f9bcf8ddbcc16955fc.pdf
    • https://static.usrfiles.com/ugd/e2c250_da20566baabe45c0975fac3d4aaf2c4d.pdf
    • https://static.usrfiles.com/ugd/a44510_56c6fa99be3e4929928ee2dfeb0b22bd.pdf
    • https://cdn.shopify.com/s/files/1/0430/9919/3501/files/4868145022.pdf
    • https://cdn.shopify.com/s/files/1/0434/6901/3144/files/51813461081.pdf
    • https://cdn.shopify.com/s/files/1/0433/0808/9499/files/71605624572.pdf
    • https://cdn.shopify.com/s/files/1/0435/6295/9006/files/bowemelimixarusilidi.pdf
    • https://cdn.shopify.com/s/files/1/0428/4183/3635/files/bajirimefoxumamaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/4405/2885/files/manodomuj.pdf
    • https://cdn.shopify.com/s/files/1/0432/9875/0629/files/46928615154.pdf
    • https://cdn.shopify.com/s/files/1/0434/2022/1607/files/55091205071.pdf
    • https://cdn.shopify.com/s/files/1/0429/8165/4679/files/a_hat_in_time_steam_achievement_guide.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_off00006324.bin
5398495791d63a044b356fc4d9e702cb1cba5b8b6ed8820dd0b241976ccb6116		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6324 5080 bytes
font_01_sfnt_off00007495.bin
4b5c6c1d32d1da29b9dc67be766b1ec5de30595c0a9830f22253d81fe30f47c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7495 10228 bytes
font_02_sfnt_off000097cd.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97CD 16092 bytes

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