Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c2ff5e9f96b95a…

MALICIOUS

PDF

42.5 KB Created: 2020-09-01 02:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13d0d6bd1898caf99ae8e6bcc700d174 SHA-1: 3066cdbf3f7a77e4ac5761fa5b95c99ff41957ee SHA-256: 81c2ff5e9f96b95a1a04fb051403d54333cc22708f23f998ec8300218831a83d
154 Risk Score

Malware Insights

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

This PDF file contains embedded links that redirect to a known malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same redirect URL, suggesting an attempt to lure the user to malicious infrastructure. 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=guide+antidotes+centre+antipoison
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/79e0dc_7bbfdfdc27d74c6b84ab1b4e0e7cdb6b.pdf
    • https://static.usrfiles.com/ugd/529dbf_9e0e0a0eb99e4fff857683d0219ff0f2.pdf
    • https://static.usrfiles.com/ugd/03ae60_7d0d99128fca49b2a526d6461857969e.pdf
    • https://static.usrfiles.com/ugd/0b46e6_65834d8c83924089977f1f568520f54f.pdf
    • https://cdn.shopify.com/s/files/1/0431/6646/6216/files/98893856574.pdf
    • https://cdn.shopify.com/s/files/1/0433/4452/7525/files/tolinaxitedosonaz.pdf
    • https://cdn.shopify.com/s/files/1/0440/3052/5605/files/excel_spreadsheet_template_for_medical_expenses.pdf
    • https://cdn.shopify.com/s/files/1/0461/7034/1528/files/welopumebojejomorab.pdf
    • https://static.usrfiles.com/ugd/b8c837_901166200ca84c9492832501ae1e2cc4.pdf
    • https://static.usrfiles.com/ugd/e8506d_cacd50cdf1b14c91a352887863e6717c.pdf
    • https://static.usrfiles.com/ugd/07e02c_e9ea5b9bb99b4ffa8410c358774fa360.pdf
    • https://static.usrfiles.com/ugd/cd79e3_7d991da6f2a541e3b04f06234d4f86ad.pdf
    • https://cdn.shopify.com/s/files/1/0437/7506/6273/files/address_in_us.pdf
    • https://cdn.shopify.com/s/files/1/0437/2388/2664/files/xotozixuzorenonedazizat.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_off00006372.bin
ae750f22bc702b80342034dfd4356094969918d6690282a82ffb8986d8400dfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6372 5068 bytes
font_01_sfnt_off000074c1.bin
287ff2d5dc8c7a08d3ee8cb28ba8f8ae9813164e111b5cacc334e2c5e84e1ffc
pdf-font-stream PDF embedded font (sfnt) at offset 0x74C1 13044 bytes