Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65f51ec80a1dffd…

MALICIOUS

PDF

49.9 KB Created: 2020-09-01 20:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84f0405b678f1f90f043e884bb8a7bd1 SHA-1: 626210ba9637966f3225699e4db051382692cc28 SHA-256: a65f51ec80a1dffd7fb2beb95a3b49c96a992196a84fb1e8aa0b2e4bfb34468d
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL that is disguised as a calligraphy practice PDF. This URL is the primary IOC. The document body, though heavily obfuscated, contains references to the same URL and other benign-looking PDF links, likely part of a link farm to improve search engine ranking for malicious content. No scripts were extracted, limiting the analysis of the payload.

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.cc/wix?keyword=calligraphy+letter+practice+pdf
    • https://cdn.shopify.com/s/files/1/0429/7926/2623/files/14045024369.pdf
    • https://cdn.shopify.com/s/files/1/0437/2883/0632/files/google_adwords_fundamentals_exam_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/2634/1272/files/86661526579.pdf
    • https://cdn.shopify.com/s/files/1/0439/4395/2539/files/restaurant_success_by_the_numbers_download.pdf
    • https://static.usrfiles.com/ugd/fd30ac_7743fa359a9f4a5398feed5f1ec3ca88.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_74bdfc6a162d4c08adc821c9c9a0dde9.pdf
    • https://static.usrfiles.com/ugd/d43733_c476fabf14824597920f8fa594cf1f12.pdf
    • https://static.usrfiles.com/ugd/5438e3_cc8e7fb1e690448282478914406dd463.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0da1d4032d04b75bf8ad127122a9d82.pdf
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/come_bless_the_lord_chords.pdf
    • https://cdn.shopify.com/s/files/1/0430/0449/3987/files/1514334456.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wulusiwebope.pdf
    • https://cdn.shopify.com/s/files/1/0433/6402/4470/files/8745729627.pdf
    • https://cdn.shopify.com/s/files/1/0433/5799/5160/files/can_t_hurt_me_em_portugues.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_off0000700d.bin
ea004f3afad7457f4a281b2c238090c28d63766a6074e0cbdccdaebf4dc92238		 pdf-font-stream PDF embedded font (sfnt) at offset 0x700D 5244 bytes
font_01_sfnt_off000081e7.bin
7952effcb0b02f00ad5ab16695f720058fc28878bc1e5488684c1c3ee4431437		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81E7 10256 bytes
font_02_sfnt_off0000a523.bin
028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA523 16312 bytes

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