Malicious PDF — malware analysis report

Static analysis result for SHA-256 18be43bb8f53fcda…

MALICIOUS

PDF

50.2 KB Created: 2020-09-02 09:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e5ddb533262c2d439d076ddb29e91eb SHA-1: 5ce7aed6cde8c006562cd5f112095bd5272521ec SHA-256: 18be43bb8f53fcdaec05b17a20564c3dc2501b64d18cdebf7abab51bc9954915
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a prominent link that redirects to a known malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. The ML classifier also strongly flagged this PDF as malicious.

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=shield+logo+wallpaper+for+android
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3844/8548/files/73641459992.pdf
    • https://cdn.shopify.com/s/files/1/0432/4907/4336/files/26856403948.pdf
    • https://cdn.shopify.com/s/files/1/0434/4994/2176/files/sosimeduti.pdf
    • https://static.usrfiles.com/ugd/88a84f_92b63d8a1b714a1197eb6a1737889913.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c0dfbb803454a58ae86d92512682165.pdf
    • https://static.usrfiles.com/ugd/35e1ce_4e40ebc20ba5439ca711765391559cd2.pdf
    • https://static.usrfiles.com/ugd/2486b5_37d14ef8276d4e11b555d839c9353283.pdf
    • https://cdn.shopify.com/s/files/1/0447/2678/0060/files/zerawidelenuxidi.pdf
    • https://cdn.shopify.com/s/files/1/0440/3222/9541/files/zixobopisifix.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/88667204560.pdf
    • https://cdn.shopify.com/s/files/1/0433/2224/5273/files/banking_awareness_september_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/0729/5140/files/the_new_national_baptist_hymnal_responsive_readings.pdf
    • https://cdn.shopify.com/s/files/1/0440/7640/0792/files/puxedi.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bf0.bin
a1a46122d442fa49962149ba4116aa682ae257603b5746d993eb62a35c13d0eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF0 5320 bytes
font_01_sfnt_off00007e16.bin
8ff62db36712c4781de70047e86e47cb37dfab3fcf9cd5926f74196c133d86df
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E16 10088 bytes
font_02_sfnt_off0000a089.bin
ee6a4f65dc2564a1b215179e62c86e1572965ce7525865a7e8e3865f4bd989b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xA089 17852 bytes