Malicious PDF — malware analysis report

Static analysis result for SHA-256 15cfc8bb33e1c632…

MALICIOUS

PDF

37.3 KB Created: 2020-08-28 23:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bc4b4421d7c50780b7cd3b8520042b8 SHA-1: 640f79e10131b06b355527f50eb10fa79ec451a0 SHA-256: 15cfc8bb33e1c632a06e1ed732889997541530082efba3137af525c03fec3f88
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous external PDF files, with the primary link leading to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the PDF structure itself suggests an attempt to obscure or distribute malicious content through a large number of links. The presence of a malicious redirector URL is a strong indicator of malicious intent.

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.ru/wix?keyword=dope+slinger+tycoon
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4599/4146/files/risk_of_rain_2_sticky_bomb.pdf
    • https://cdn.shopify.com/s/files/1/0434/9270/4408/files/gejisewixisexip.pdf
    • https://cdn.shopify.com/s/files/1/0435/9775/8622/files/15341553624.pdf
    • https://cdn.shopify.com/s/files/1/0431/1390/6327/files/png_bestanden_samenvoegen_tot.pdf
    • https://static.usrfiles.com/ugd/b8c837_3fb184f1e6c64fce87677d71e045335f.pdf
    • https://static.usrfiles.com/ugd/b8c837_472b0cba763d46308803ba4754990508.pdf
    • https://static.usrfiles.com/ugd/b8c837_38c8f7ec8ff14a9e93db357aff1485b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd4141fcf85948148f7b269342f39ab0.pdf
    • https://static.usrfiles.com/ugd/b8c837_0893b9117fc24951aa6f7b0ce4139260.pdf
    • https://static.usrfiles.com/ugd/b8c837_97ae035b272045479be49a6e15ce87e1.pdf
    • https://cdn.shopify.com/s/files/1/0431/0987/5873/files/moxomajoj.pdf
    • https://cdn.shopify.com/s/files/1/0438/0003/5485/files/latex._bib_format.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/94170380923.pdf
    • https://cdn.shopify.com/s/files/1/0429/2807/9004/files/vidmate_for_android_device.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_off000050a8.bin
d1e12b876de3aa2165af882aa9e88f039e6fc41dfb7165280b386129dc5af205
pdf-font-stream PDF embedded font (sfnt) at offset 0x50A8 4992 bytes
font_01_sfnt_off000061c6.bin
312f6864b06dc9f760b6d8170933302571a91419799210585ea8357d9e1279f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x61C6 12180 bytes