Malicious PDF — malware analysis report

Static analysis result for SHA-256 588eecad035c8e63…

MALICIOUS

PDF

41.2 KB Created: 2020-08-31 20:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13291aa65be28513ba1014a2d8c35bc6 SHA-1: 4d2764cbffc8dbff71fb4aa6e0bb28c9a8da0b41 SHA-256: 588eecad035c8e63b94455076200628640fdb7440416656ffe702010b01b9e19
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at ttraff.cc. This suggests a link farm or SEO poisoning attack designed to lure victims to malicious content. The document body, though heavily obfuscated, contains the target phrase 'hmh collections grade 8 pdf' and the malicious URL, reinforcing the lure. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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.cc/wix?keyword=hmh+collections+grade+8+pdf
    • https://cdn.shopify.com/s/files/1/0438/2952/6688/files/74513052669.pdf
    • https://cdn.shopify.com/s/files/1/0434/6819/3952/files/77813009559.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/92797764050.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9814/files/41922375374.pdf
    • https://static.usrfiles.com/ugd/b8c837_e2afee2d1ed94bb7932a785aa751725c.pdf
    • https://static.usrfiles.com/ugd/6cfc61_73057564d63741e286084d65e9640304.pdf
    • https://static.usrfiles.com/ugd/b914b5_63da162b04f64f95a8124e0849a51e6e.pdf
    • https://static.usrfiles.com/ugd/158fb9_71e2c0379985421c8a927992df21dedd.pdf
    • https://static.usrfiles.com/ugd/63d3ad_d10875e4200b41ddb956b21daf157863.pdf
    • https://cdn.shopify.com/s/files/1/0433/4374/1083/files/kupikamapaxodijivatukeri.pdf
    • https://cdn.shopify.com/s/files/1/0441/2620/8152/files/kubupaxovuvuxaga.pdf
    • https://cdn.shopify.com/s/files/1/0440/4792/5413/files/concerto_for_2_violins_in_a_minor_rv_522.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d4e1cf16d9b4a529084a09c86d02914.pdf
    • https://static.usrfiles.com/ugd/565485_73634b9145f44402921c782b15081564.pdf
    • https://static.usrfiles.com/ugd/b8c837_94a74801f76b4755a92aa15516616763.pdf
    • https://static.usrfiles.com/ugd/cac9e4_a85b7571ccdd4117ba3561c49dbf797e.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc49fc282ce94bc688b41131689e017e.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_off000060b4.bin
83aa84905ce40cb756b5b73f0bf73142c732ef4f163cad80fb487368287c8d14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B4 5724 bytes
font_01_sfnt_off00007408.bin
e5713ccbe774bef79b2788fd401eef5c57379a8ba0ae93e7c04db19b2e7494f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7408 10504 bytes

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