Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac2b6e0771bfab1…

MALICIOUS

PDF

45.8 KB Created: 2020-11-04 21:25:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: decb670b8c700c05a7e31ce9ab86238d SHA-1: 121b37246956c1bba61465aecafb837de2148740 SHA-256: fac2b6e0771bfab11ff6e65fff3e18e870a6eecf4f30c3cdd7c529e429197d24
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector link farm. The primary malicious URL, 'https://ttraff.club/123?keyword=colegio+agustiniano+suba', is presented within the document body, disguised as a book title. This suggests a phishing or malware distribution attempt, leveraging a common social engineering tactic.

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/123?keyword=colegio+agustiniano+suba
    • https://cdn-cms.f-static.net/uploads/4382961/normal_5f8dd2744fb44.pdf
    • https://cdn-cms.f-static.net/uploads/4391954/normal_5f9a843cdc0c8.pdf
    • https://cdn-cms.f-static.net/uploads/4419637/normal_5f973c8c56671.pdf
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/3686148.pdf
    • https://cdn-cms.f-static.net/uploads/4452152/normal_5fa213b8b00a3.pdf
    • https://cdn-cms.f-static.net/uploads/4370053/normal_5f8999b089367.pdf
    • https://gonerogad.weebly.com/uploads/1/3/1/4/131438616/dujusona.pdf
    • https://cdn-cms.f-static.net/uploads/4386336/normal_5fa16bf374438.pdf
    • https://jenevokitajawol.weebly.com/uploads/1/3/4/2/134235402/522561.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/672a0596-5c27-4854-8c3c-1179205ba516/le_livre_perdu_des_sortilges_tome_2.pdf
    • https://s3.amazonaws.com/gupuso/lemutudinenizumufipuzes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065ab.bin
d41e8b8322c462398ba1b5c69bb1eb5279555ed9a2fbcd904b9d9de90c912ca0
pdf-font-stream PDF embedded font (sfnt) at offset 0x65AB 4804 bytes
font_01_sfnt_off00007616.bin
922fada7ae8987031dcb917910acd16e9fb6ec7951573ea3d45db498422c7232
pdf-font-stream PDF embedded font (sfnt) at offset 0x7616 11928 bytes
font_02_sfnt_off00009c9c.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C9C 4324 bytes