Malicious PDF — malware analysis report

Static analysis result for SHA-256 9943a84aeda4c9fd…

MALICIOUS

PDF

47.2 KB Created: 2020-09-04 15:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd14d651da009f235ed88d6caf090cdd SHA-1: d9130a24878891a8403f2735612927aed7c985b4 SHA-256: 9943a84aeda4c9fd3577d39fb396a71cdd24a3cec4df30dd70156c1d6ec1306d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF document contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'Facebook desktop version' and the malicious URL, suggesting a phishing lure. The ML classifier also strongly indicated maliciousness. The primary IOC is the redirector URL, which is likely used to host further malicious content or phishing pages.

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.me/wix?keyword=facebook++desktop+version
    • https://cdn.shopify.com/s/files/1/0437/1808/2711/files/31683679075.pdf
    • https://cdn.shopify.com/s/files/1/0457/8384/2982/files/99196718421.pdf
    • https://cdn.shopify.com/s/files/1/0431/4831/2738/files/activity_diagram_in_ooad.pdf
    • https://static.usrfiles.com/ugd/36d413_6a213d7720ee4140b270b638c1648eac.pdf
    • https://static.usrfiles.com/ugd/6cfc61_b82c0f4afa554292aad220d49f914ab9.pdf
    • https://static.usrfiles.com/ugd/ed8107_2076b86ac92145d2a3f7d5b272232028.pdf
    • https://static.usrfiles.com/ugd/6a44d8_faa3d9af481c41dfa824cc2c3673f6f7.pdf
    • https://static.usrfiles.com/ugd/e5a943_7e10a6d1bc1e43dfacedd6dbde00b7d1.pdf
    • https://static.usrfiles.com/ugd/7d21c0_1426cbbdc1844f4781015a314f930dd2.pdf
    • https://static.usrfiles.com/ugd/d162e3_1e5d9013a205408b8741928975d1b5d7.pdf
    • https://static.usrfiles.com/ugd/5360f8_788cd8c178c14a28b3c91ca68d1b7788.pdf
    • https://static.usrfiles.com/ugd/02beb7_7a802cdb624a4c699d894957d01351aa.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006db2.bin
14aa122173b3e004966f4268d483d065cc0885b57ef94625172d029f57a95e71
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB2 5252 bytes
font_01_sfnt_off00007f96.bin
3e6c323c9e67c04efddc5e9d761c360b2a452c22c2c4ae0ae2381f21a2f52bda
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F96 2344 bytes
font_02_sfnt_off000089ff.bin
603527551fcfd286b1d63a8b6103a0212e88f2b321f9f6488e2503c029d11c62
pdf-font-stream PDF embedded font (sfnt) at offset 0x89FF 11216 bytes