Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4de6509beb8d23…

MALICIOUS

PDF

39.4 KB Created: 2020-09-02 02:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84739b474c5ac85b41870f5086af5330 SHA-1: 267e0dc58df2c110842da0275615bad410ca2377 SHA-256: 5d4de6509beb8d23f455cc301e18f40640439cfac9e5c55a82c985c22cdbbdcb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely intended to lead the user to a malicious site. The document body and embedded links suggest a lure related to 'vocabulary flip book template pdf', aiming to trick users into clicking the malicious link. The ML classifier 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.com/wix?keyword=vocabulary+flip+book+template+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/9949/4302/files/66177838977.pdf
    • https://cdn.shopify.com/s/files/1/0461/9485/1998/files/geographical_norway_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/8838/0061/files/ribodu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8645/3663/files/43441618675.pdf
    • https://cdn.shopify.com/s/files/1/0434/9794/7300/files/20093414479.pdf
    • https://static.usrfiles.com/ugd/73f3b0_ece39a43e97f46f1becdf02e4d29d6dc.pdf
    • https://static.usrfiles.com/ugd/03ae60_7f089a185c0a493b90747a61efbc2cae.pdf
    • https://static.usrfiles.com/ugd/0779a3_18468ce5258b41bb9ad0b8cdbe3e8907.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_6abc0aca69b5476383aa4dd2aafca9ab.pdf
    • https://cdn.shopify.com/s/files/1/0432/0450/9853/files/53527941709.pdf
    • https://cdn.shopify.com/s/files/1/0433/0124/0985/files/73332534833.pdf
    • https://cdn.shopify.com/s/files/1/0433/4295/4651/files/biliary_sepsis_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0435/7645/9422/files/two_player_stickman_game.pdf
    • https://cdn.shopify.com/s/files/1/0431/4349/5841/files/tapirazutogodeka.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_off00005c18.bin
d888eca0c1d173cefaab53e683a7933b256be2e0ac86473b21d343d75901763d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C18 5392 bytes
font_01_sfnt_off00006e65.bin
d43af21f57b81be62e0884e7950bb66a081e621c0b1bccb5ac78defdeed0174c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E65 10064 bytes