Malicious PDF — malware analysis report

Static analysis result for SHA-256 6716b94c5d0f5bac…

MALICIOUS

PDF

40.5 KB Created: 2020-08-20 00:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ab60acbe0fa61683ded1947ea64db16 SHA-1: 7fc1ef301471c71ce823ba8bfcd29fade5918050 SHA-256: 6716b94c5d0f5bac0ea9ba1565085feab178439a76f505afad262fc5ac312b67
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a malicious redirector link, https://ttraff.cc/pify?keyword=onclick+not+working+inside+form, which is a strong indicator of malicious intent. The document also employs a social engineering lure, instructing the user to install a browser extension or update, a common tactic for malware delivery. The presence of numerous external PDF links suggests a link farm used to obscure the ultimate destination or to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/pify?keyword=onclick+not+working+inside+form
    • http://files.linwilliamcong.org/uploads/1/3/1/0/131069934/pukiv_tiluk_mowetapeni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7555/0876/files/5367607939.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4032/files/35689623735.pdf
    • https://cdn.shopify.com/s/files/1/0436/8583/9003/files/62285880083.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/98385666630.pdf
    • https://cdn.shopify.com/s/files/1/0427/7141/5196/files/kawajokevudolipol.pdf
    • https://cdn.shopify.com/s/files/1/0430/2556/3799/files/belgard_catalog.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/annabel_lee_lost_love_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/2959/2214/files/cast_int_to_string.pdf
    • https://cdn.shopify.com/s/files/1/0434/7327/2992/files/54352158768.pdf
    • https://cdn.shopify.com/s/files/1/0429/9145/2314/files/65187519040.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_off00005722.bin
53609cb5265eb4a6088aadc9a66c254850ddf79318e7358c36c06bca57f9029c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5722 5316 bytes
font_01_sfnt_off00006935.bin
8f84ed611d427095d4c2e67832fce32c9405dd1c7c24351815f89672b61eabf3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6935 14024 bytes