Malicious PDF — malware analysis report

Static analysis result for SHA-256 0937a4aeeb394459…

MALICIOUS

PDF

40.0 KB Created: 2020-08-30 06:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 868d4efa31638cc21ea01b6605b80d7c SHA-1: 3dc1a56432aeadfba580c5b8b068e84102fe3d5e SHA-256: 0937a4aeeb394459eadd204b59f5c7e1be4d576a9c9b7e855ff34cf5b63d19c9
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious URL, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. It also features a link farm of other PDFs, as indicated by 'PDF_SEO_LINK_FARM'. The ML classifier strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which is likely used to lure victims to malicious content.

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=horary+chart+love
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/fd7405_8ccec8f792424c6d9ae79d755b6405db.pdf
    • https://static.usrfiles.com/ugd/5e81b9_befa129cb36341b4b23a048d603602a5.pdf
    • https://static.usrfiles.com/ugd/73cb9e_30a5e0fadf684a2f852acee589e37300.pdf
    • https://cdn.shopify.com/s/files/1/0430/6832/6042/files/nedowowixuxibudawusaxutot.pdf
    • https://cdn.shopify.com/s/files/1/0433/3702/3641/files/direct_speech_into_indirect_speech_interrogative.pdf
    • https://cdn.shopify.com/s/files/1/0429/0599/3375/files/saxon_math_8_7_with_pre_algebra_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0429/9803/8679/files/pufubodiwozifipakazopix.pdf
    • https://static.usrfiles.com/ugd/493135_cb7e9d27be69425abc1e3e62ff7a2561.pdf
    • https://static.usrfiles.com/ugd/1be480_6f41766ceb304d54bc6b22104c9898ae.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_da9e3bc05ac64a9bbcea6a51f1309d49.pdf
    • https://static.usrfiles.com/ugd/8b2c09_3950ef36d8f5458e8175b0148e0f99b2.pdf
    • https://static.usrfiles.com/ugd/cdb50c_35d0fe9796384c5b8e16d5ca0ddb377b.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_off0000601f.bin
d339c238de5e0b0f131c7b4a0cbb20a3943eae41cbb94807dd018cec46a0686d
pdf-font-stream PDF embedded font (sfnt) at offset 0x601F 4832 bytes
font_01_sfnt_off0000708a.bin
0296f6154a494a56a38fd838dbc7e4f3ceb3dac9d3f237b32bff85dde7d571a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x708A 10412 bytes