Malicious PDF — malware analysis report

Static analysis result for SHA-256 158842f359d70f54…

MALICIOUS

PDF

43.1 KB Created: 2020-08-17 17:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abc6b39e4fa7cbae887319408ed502bd SHA-1: 7682d3beddfb666cd85ffd8cdc8a0d63e6a4f301 SHA-256: 158842f359d70f54e1d32b5478a3e2fa25bbabea052644ef7166f5a8d778ffab
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a URL designed to trick users into believing they can hack Wi-Fi passwords. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDF files, likely for SEO manipulation or to distribute further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=hack+wifi+password+wpa+android
    • http://files.thefraternalsociety.org/uploads/1/3/1/6/131606605/sotinulo_sosajosugukurig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/6160/6550/files/lukadasi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6834/8830/files/tenusiwojitosak.pdf
    • https://cdn.shopify.com/s/files/1/0437/4324/8545/files/instrumen_penilaian_akreditasi_puskesmas_terbaru.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/natenojutuwab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/runuwadobona.pdf
    • https://cdn.shopify.com/s/files/1/0435/1731/3178/files/zupimofakepukararoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8027/7406/files/44049551990.pdf
    • https://cdn.shopify.com/s/files/1/0434/2690/6261/files/mcanisme_d_accouchement_normal.pdf
    • https://cdn.shopify.com/s/files/1/0431/1446/3394/files/4101871661.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_off00005e3d.bin
6d2c0b8beb8b53a35e5310df908874602e7184c7ef1cf4c24e62007698c4c0ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3D 4824 bytes
font_01_sfnt_off00006ead.bin
018c9567d469d09b7e5f391f6e6aa2054b155bb9acd344a91f8cad9ebd4556fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAD 10216 bytes
font_02_sfnt_off000091a7.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x91A7 4324 bytes