Malicious PDF — malware analysis report

Static analysis result for SHA-256 6087e5b7602ebe3f…

MALICIOUS

PDF

47.5 KB Created: 2020-09-05 23:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0784a8bed27490b74300e2c1442697e0 SHA-1: f192bd5773d0508424bc40dea2addc790dd14263 SHA-256: 6087e5b7602ebe3f1048b2a76978e89c48e67b2e9147346caae481a6609fa96c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify, and one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirector, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness.

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.club/wix?keyword=spanish+verb+conjugation+study+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/mitimitotifijipubirozo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49839171509.pdf
    • https://cdn.shopify.com/s/files/1/0433/9043/5495/files/banivafiwazar.pdf
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/gulidepegotafi.pdf
    • https://cdn.shopify.com/s/files/1/0439/5896/0286/files/golepotozufofinadovuwukor.pdf
    • https://cdn.shopify.com/s/files/1/0432/6499/9588/files/22570888241.pdf
    • https://cdn.shopify.com/s/files/1/0430/5934/7618/files/zonusojoredovobugasatekiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8709/4177/files/cambridge_key_english_test_4_free_download.pdf
    • https://static.usrfiles.com/ugd/0d2908_992572974a5140b4b1452d18e255a4e7.pdf
    • https://static.usrfiles.com/ugd/a4e402_d7285a4ede204e06ac47bcdde8b6b7ad.pdf
    • https://static.usrfiles.com/ugd/99965f_e7540c1f72cb4ff895bb1b5c292515e3.pdf
    • https://static.usrfiles.com/ugd/7a359d_508534293608446ba3e137941aff73db.pdf
    • https://static.usrfiles.com/ugd/5bb01c_4db1cfab1a34418a9e839d770762cd90.pdf
    • https://static.usrfiles.com/ugd/b8c837_094417feb9f5406e903493728ffa6467.pdf
    • https://static.usrfiles.com/ugd/76b6de_af7fddfdd27a4006bf2fecc3fe67c411.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006551.bin
cc152f258736c65d3c7530dfe7b1f4a73c5fd061d3fe86c80c3a92f990525fc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6551 5784 bytes
font_01_sfnt_off00007904.bin
ea182c85cce27a3510657708159e4ee4a6092ccbc586d7848b5abc8db5f923a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7904 9920 bytes
font_02_sfnt_off00009b36.bin
028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B36 16312 bytes

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