Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae0ec90e6a99991…

MALICIOUS

PDF

47.3 KB Created: 2020-08-30 10:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f4df35bf542d7588b7223baf09f0e5f SHA-1: fcb7827e405d25d33c62e16df579605428190741 SHA-256: cae0ec90e6a999914e3b84d042d3dee69133ef88e9d4d8cced2404487a5a2ddc
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for phishing or malware distribution. One of these links, https://ttraff.me/wix?keyword=proyeccion+de+peters+para+colorear, points to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself appears to be garbled text, but the presence of the malicious URL and the link farm heuristic suggest a lure to external 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.me/wix?keyword=proyeccion+de+peters+para+colorear
    • https://static.usrfiles.com/ugd/b8c837_0e81fd44c89242d781c1bddc7448a2a8.pdf
    • https://static.usrfiles.com/ugd/bf650e_411a5f7609d64e3386ad400f7b8b16bf.pdf
    • https://static.usrfiles.com/ugd/12f4eb_49cc67ec881d46858ff201e00ddce84e.pdf
    • https://static.usrfiles.com/ugd/0bcf16_f804360c83b64e7bbb9014d66c3667e2.pdf
    • https://static.usrfiles.com/ugd/158fb9_b11a237aaa384d02a1e6df654179721e.pdf
    • https://static.usrfiles.com/ugd/a31856_a87ed4be2d344ca48a9e040a50ab86ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9b8e2d6641343489e16d1e6645c7033.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f93db84c03e4e7a9d5561b7b233a31e.pdf
    • https://static.usrfiles.com/ugd/16a96a_a713150310924e45bd2da44aa7f26bea.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9d0e69fed0b4d15aeb4fd200332a5b8.pdf
    • https://static.usrfiles.com/ugd/76de1a_7401561f73084995b2a8b5c75ab863aa.pdf
    • https://static.usrfiles.com/ugd/accd1f_adb008fd376643d396c3042338d16481.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6e2d46d0e454a4c8ba63f7b806c40a2.pdf
    • https://static.usrfiles.com/ugd/32acb1_cf1c5de195e344c1b05edcb0207e96f6.pdf
    • https://static.usrfiles.com/ugd/df4650_c1b0238c120d4395ae9b4da021d5ed44.pdf
    • https://static.usrfiles.com/ugd/b8c837_61462ffe63534f3cb1f39665c46fd009.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_off00007843.bin
6f91160f8270bf18a6d6a54ac77e059444257990641bd50a8f0c15308ea03eaf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7843 5172 bytes
font_01_sfnt_off000089e3.bin
62b4706d2af8cb6ebeda471a0b1e7725d6324663f86728cbd54a255fbba915f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x89E3 11236 bytes