Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd71ae2183d338e…

MALICIOUS

PDF

33.6 KB Created: 2020-08-04 02:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a467666caa46632e88ca5ab3fac05372 SHA-1: f0b0aabf5f8d5d79fbc0261b8dadbb01db65f6eb SHA-256: dfd71ae2183d338e7166c276a5368c8f5a0855e2c4ca3d2fa219781ec1eb92d0
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as free book downloads, but the primary link redirects to malicious infrastructure. The document body text and embedded URLs strongly suggest a social engineering lure to trick users into clicking the malicious link. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.ru/pify?keyword=new+cutting+edge+intermediate+student+s+book+pdf+free+download
    • http://files.cindyjaquier.com/uploads/1/3/0/8/130814680/ece93bb94.pdf
    • http://files.noyirionworks.com/uploads/1/3/0/9/130969190/retilek.pdf
    • http://files.sinnerstage.com/uploads/1/3/2/3/132303043/zigusuwuribesun_lulowopunoritez.pdf
    • http://tuxeniso.earthandwaterwellness.com/uploads/1/3/2/7/132712109/0d1d707d9f16df9.pdf
    • https://cdn.shopify.com/s/files/1/0432/1122/7300/files/71824212309.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/97589159167.pdf
    • https://cdn.shopify.com/s/files/1/0433/1202/1662/files/timber_mod_1._11._2.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99289858455.pdf
    • https://cdn.shopify.com/s/files/1/0434/9735/7472/files/youtube_to_mp4_unblocked.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41078692832.pdf
    • https://cdn.shopify.com/s/files/1/0438/3545/7696/files/craftsman_garage_door_opener_keypad_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kosetomamevisired.pdf
    • https://cdn.shopify.com/s/files/1/0429/8113/0394/files/luwevodizi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/age_of_empires_2_mac.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_off000044ae.bin
570108518afbf2a46d86c3a1193720cc4f9b156939ddc7ac5fdb95a7c14682a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44AE 5740 bytes
font_01_sfnt_off00005835.bin
53ce4f2198d8e7e574d168e4fc4ac70d4296ae58441fdaaf80bccf5bf3137e09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5835 9784 bytes

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