Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d428bdf4fdf5f8…

MALICIOUS

PDF

43.8 KB Created: 2020-08-28 13:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed6b231f8ed3b4dd2663ef2430df28a9 SHA-1: b0e350d465570dbe9f06dc2d693c9530636dc526 SHA-256: 73d428bdf4fdf5f88596ccaca2861a9b13cff8cf0eed1ba278ee3c8a15c03b89
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a lure related to a humidifier manual, but the primary malicious functionality is a link farm. It redirects to a malicious redirector infrastructure, which then leads to a large number of other PDF links. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs and a download button lure further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=procare+cool+mist+humidifier+pccm+840+manual
    • http://files.masakiphotography.com/uploads/1/3/1/4/131438046/vekarudesi.pdf
    • http://files.b2autodesigns.com/uploads/1/3/1/6/131636719/mevamewimozoxaxasiwe.pdf
    • http://mebedega.dixiehighcounseling.org/uploads/1/3/0/7/130740073/4089089.pdf
    • http://files.accssfn.com/uploads/1/3/0/7/130776511/zotokuv-dokolazave-bedesul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1283/3959/files/connecticut_dmv_form_b350.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/98671585888.pdf
    • https://cdn.shopify.com/s/files/1/0427/8494/8380/files/26942980583.pdf
    • https://cdn.shopify.com/s/files/1/0430/2821/8010/files/56740059844.pdf
    • https://cdn.shopify.com/s/files/1/0428/1955/1388/files/treble_and_bass_clef_note_naming_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9499/files/36711204001.pdf
    • https://cdn.shopify.com/s/files/1/0435/1708/3803/files/87370797904.pdf
    • https://cdn.shopify.com/s/files/1/0434/5289/1298/files/xuragajejotebegesilejak.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/lofulezuponoforidomi.pdf
    • https://cdn.shopify.com/s/files/1/0435/8170/2301/files/asvab_word_knowledge_list_2017.pdf
    • https://cdn.shopify.com/s/files/1/0430/1045/7753/files/gukabil.pdf
    • https://cdn.shopify.com/s/files/1/0433/9420/3806/files/xumorudaletubeme.pdf
    • https://cdn.shopify.com/s/files/1/0431/7652/5984/files/33327605742.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_off00006a80.bin
0f2b27b6b591070cb8c1ed834f751819ac5b11433d006f1d4d4d608c6612bb09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A80 5820 bytes
font_01_sfnt_off00007e2d.bin
2f46ee7e0a9c308346621fde8700600bd5a323a7247112422016676b0399d7f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E2D 10620 bytes

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