Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c521daa6fb6b4a…

MALICIOUS

PDF

39.1 KB Created: 2020-08-30 05:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc644ec2a6dd2a428003972d68dff2cc SHA-1: 2a3f9747f073e743b40e0f7a1cdf266f6f4e8dbb SHA-256: 53c521daa6fb6b4abc0f729ab0a729e5b7350015196c3f45b266f3017fd3ca6f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier as malicious and contains a large number of embedded external links, characteristic of a link farm. One of these links, https://ttraff.cc/wix?keyword=lord+of+the+flies+timeline, points to a known malicious redirector. This suggests the document's primary purpose is to lure users to malicious sites, likely for phishing or malware delivery.

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=lord+of+the+flies+timeline
    • https://static.usrfiles.com/ugd/b8c837_ef41905ea79741ee8c06a51639c6abb8.pdf
    • https://static.usrfiles.com/ugd/409ca8_46d0b2bde085453da808ba36ddcc2040.pdf
    • https://static.usrfiles.com/ugd/cc14e4_89599bd1fe38493389ce10a0021fe294.pdf
    • https://static.usrfiles.com/ugd/b8c837_2510d2264deb4f169ffe51de2ba550b7.pdf
    • https://cdn.shopify.com/s/files/1/0431/1253/0081/files/aronson_social_psychology_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/0219/2284/files/aqa_a_level_sociology_book_one_including_as_level.pdf
    • https://cdn.shopify.com/s/files/1/0430/7632/1434/files/sacrament_meeting_agenda.pdf
    • https://cdn.shopify.com/s/files/1/0432/0080/7070/files/naredopekuxopani.pdf
    • https://cdn.shopify.com/s/files/1/0438/0993/1426/files/17383916423.pdf
    • https://cdn.shopify.com/s/files/1/0439/5083/3822/files/4701966883.pdf
    • https://cdn.shopify.com/s/files/1/0428/3095/4655/files/latin_for_americans.pdf
    • https://static.usrfiles.com/ugd/2e79a6_e82be92ade41460e830490a339a420b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_6836a9617dd74fd388871391ef6bd062.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e1d.bin
5a273e9e1c2b6151fbb6edf9de4a377074c96f1776706f128bbad0cc956806ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E1D 4876 bytes
font_01_sfnt_off00006e90.bin
34dd9aab5489b0517d20290b56b896e63e7886aa3a1362a00cd6f220466fef41
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E90 9708 bytes