Malicious PDF — malware analysis report

Static analysis result for SHA-256 13822eb5a6a9379b…

MALICIOUS

PDF

34.3 KB Created: 2020-09-18 16:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba3a9a5640ddaa9b41a28dd12d112348 SHA-1: 0d6eae7fa43f38836245313020b0436d964826b3 SHA-256: 13822eb5a6a9379b382dc06920ad7ceff3119ac9aa9c1814b68b0b24a919d642
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one specifically identified as pointing to malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to drive traffic to malicious sites.

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.club/wix?keyword=dominic+janes+instagram
    • http://zakif.paulmakuchalsart.com/uploads/1/3/0/7/130776246/2f090c0ebb94d.pdf
    • http://jimixu.janosiklab.com/uploads/1/3/2/8/132814097/sagexaniweniwi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6d859ebb-a286-4321-a784-1ffe78b7f1fe.filesusr.com/ugd/eb6c48_d14dc8dfe94b4e518e2814ef7eae498a.pdf?index=true
    • https://189d9555-a9b4-45a7-b185-9d64f657da64.filesusr.com/ugd/f1d680_c9b70d82e2fd4d95a5e5977bc566176d.pdf?index=true
    • https://441d800c-4722-4326-9837-5b89ba2cdba7.filesusr.com/ugd/24deb6_805d8db9b1c54a5b939944614eec915b.pdf?index=true
    • https://5cddba75-9026-4a0a-be37-97cb79c818e5.filesusr.com/ugd/4d548e_72431bd79e604843aaab8b7254f0f8bc.pdf?index=true
    • https://f2539c0b-7fc4-4f36-ac36-c8fe840741f5.filesusr.com/ugd/c83fdb_3672ef6e0b6d493fbbe8785e5f40d752.pdf?index=true
    • https://f4154027-65c1-4671-878b-982747e1ba19.filesusr.com/ugd/ad2ade_a6218165edbe48458801b68a46b149b3.pdf?index=true
    • https://03e6f37a-6d3b-4c8d-93b4-34666bcb57b1.filesusr.com/ugd/23a6c3_900b05970cec4d4b95f0da3a8b3e60a3.pdf?index=true
    • https://f905bd63-4a33-4749-8908-9e1e4e75c1c0.filesusr.com/ugd/7603ae_e8dd7d79231241da868ad1bd5b2486b4.pdf?index=true
    • 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_off00004818.bin
ec35ff3863ce64a8354bed113d52ebdc051831647b2394fd5000eac69f02855a
pdf-font-stream PDF embedded font (sfnt) at offset 0x4818 5160 bytes
font_01_sfnt_off00005999.bin
9078c4b96f8c991ec8bc0450db425225e58bc07159e6bf831334988668c95876
pdf-font-stream PDF embedded font (sfnt) at offset 0x5999 10372 bytes