Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d07cca16253ea78…

MALICIOUS

PDF

48.5 KB Created: 2020-08-29 20:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfb051d0241f771f9b6b51f2981de468 SHA-1: 2ddfb05d11af6ee0d886a3c56364b6c760353a1a SHA-256: 6d07cca16253ea78b4f2a90618ee6231d1f8be0a390f67174fc010194902ee96
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.cc/wix?keyword=anno+1800+cheat+engine', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files, suggesting a link farm or redirection scheme. 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.cc/wix?keyword=anno+1800+cheat+engine
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_36b6200aaca448909f4265ebb34b6f3a.pdf
    • https://static.usrfiles.com/ugd/b8c837_06c94ce8b47e43228f51319a208a66f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5d5f1db93b345bcac292f10af032b67.pdf
    • https://cdn.shopify.com/s/files/1/0437/3502/3770/files/81133280439.pdf
    • https://cdn.shopify.com/s/files/1/0438/1949/9682/files/89307404873.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3481/files/40542995439.pdf
    • https://cdn.shopify.com/s/files/1/0430/8202/3061/files/77284330948.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf4dafc8180c4630bfbebbdf1f5301c9.pdf
    • https://static.usrfiles.com/ugd/b4a829_d8e22e54f5c645c8aead0f26a85917f9.pdf
    • https://static.usrfiles.com/ugd/b8c837_494b674d3d2d4f348e7832e93e021c24.pdf
    • https://static.usrfiles.com/ugd/b8c837_1d857966b17f415e9e175e82239d8f4d.pdf
    • https://static.usrfiles.com/ugd/ca300b_80d27238a5fd4a77b0f8e47e82884000.pdf
    • https://static.usrfiles.com/ugd/b8c837_8cccca3c255e402999d60d41ee98f2f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_05ac857d6e664b3b910f3edfe205fdd3.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000747e.bin
8782e33771a3e14c225010cdbe49bb32b1465381de7c2edc3d3e6f4eadeee157
pdf-font-stream PDF embedded font (sfnt) at offset 0x747E 5132 bytes
font_01_sfnt_off000085f4.bin
bfdca789fc2125e423529a382428ae42cf2f1cedf6233bcb462526afe543f722
pdf-font-stream PDF embedded font (sfnt) at offset 0x85F4 15388 bytes