Malicious PDF — malware analysis report

Static analysis result for SHA-256 856b8c901620d09d…

MALICIOUS

PDF

41.4 KB Created: 2020-09-15 03:39:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ef27bfa8d6dbb3f2e615ac5525e8393 SHA-1: 667932ec0f4fbd0bf89ed0debe99bf11c51e51c7 SHA-256: 856b8c901620d09d3b1a6d964a063bd7b2c4586e613c9239f1194d13d7de4d9f
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing indicating it links to known malicious redirector infrastructure. The document body also contains a URL that appears to be a lure for downloading an application. The presence of numerous external links, many pointing to PDF files on static.usrfiles.com, suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites.

Heuristics 3

  • 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.
  • 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.me/pify?keyword=hot+wheels+race+off+mod+apk+latest+version
    • https://static.usrfiles.com/ugd/3f8d85_ba25816e994a47fb937476e6fbf05b20.pdf
    • https://static.usrfiles.com/ugd/21b4a7_2e03c0a375d64c9bb74c4740e2b00618.pdf
    • https://static.usrfiles.com/ugd/f84671_e0462b770c554c4990f7bf78e811553f.pdf
    • https://cdn.shopify.com/s/files/1/0437/9718/4673/files/forever_probiotics.pdf
    • https://cdn.shopify.com/s/files/1/0430/7219/2669/files/geopolitica_y_defensa_nacional.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6282/files/learning_styles_test.pdf
    • https://cdn.shopify.com/s/files/1/0437/3282/8314/files/581847594.pdf
    • https://cdn.shopify.com/s/files/1/0433/7611/5863/files/skype_mi_nht_cho_win_xp.pdf
    • https://static.usrfiles.com/ugd/1e11d0_473512e737a74eabb246dcf0696a2378.pdf
    • https://static.usrfiles.com/ugd/599f1c_f0af8c9a4bae4855a863d7f1d1189415.pdf
    • https://static.usrfiles.com/ugd/9d7ad9_275b139c706d4400b7957040f1d4d88f.pdf
    • https://static.usrfiles.com/ugd/18f527_91ea4700bd4d4d5598db83ad125c19d1.pdf
    • https://static.usrfiles.com/ugd/8a05ec_771e468389be45538fa126883bfaf134.pdf
    • https://cdn.shopify.com/s/files/1/0432/9403/2025/files/kekexenedekiwogaboliku.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/nikon_d60_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/4100/5480/files/38996993955.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0901/files/zedosu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000610d.bin
0f4f41ee7110ab88dfa930aab868aa61f18d83822337f3798285d4b2f4b96a2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x610D 5572 bytes
font_01_sfnt_off000073e8.bin
0397034357c24e6ffb25834970f8fe8a3a250ce661cb780f7f945131a9dd0ff7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73E8 10916 bytes

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