Malicious PDF — malware analysis report

Static analysis result for SHA-256 119c936077064401…

MALICIOUS

PDF

39.8 KB Created: 2020-08-19 15:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf14d5734a86443faf2a21599d22e5d2 SHA-1: 20f96552eb0c3d054361f983474bacb63190d75b SHA-256: 119c936077064401f33674ff929db4e2fc6145add398a62b71d7596fef8c284c
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a malicious redirector. The 'SE_DOWNLOAD_BUTTON' heuristic suggests a lure to click these links. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links point towards a phishing or redirection attack, likely initiated via spearphishing.

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.ru/pify?keyword=comparative+adjectives+worksheet+printable
    • http://files.salsamama.org/uploads/1/3/0/8/130873830/lisetutakotufoxepis.pdf
    • http://labolatim.alaskarvadventures.com/uploads/1/3/0/8/130814995/zanum.pdf
    • http://pivufarur.peter-m-acland-foundation.org/uploads/1/3/1/4/131407995/jurasarerutumasiz.pdf
    • http://files.southgateanimalhospital.ca/uploads/1/3/1/4/131454221/7703610.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6321/3209/files/small_laparotomy_set_count_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/damipibatosalabikenaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xaxigeruver.pdf
    • https://cdn.shopify.com/s/files/1/0431/2639/0951/files/babozekufazexunet.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/6751730088.pdf
    • https://cdn.shopify.com/s/files/1/0433/7896/6686/files/tratamiento_de_absceso_periodontal.pdf
    • https://cdn.shopify.com/s/files/1/0434/7628/7648/files/dorikepupumeselofederafax.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_off0000596a.bin
c4a1ebd093e5c044cc4a7c9ebd55a5f8f6dfefb32f775001bb8df9a06b237684
pdf-font-stream PDF embedded font (sfnt) at offset 0x596A 5648 bytes
font_01_sfnt_off00006c8b.bin
4aa9eb4ed8f386e01eef44d91c4009746c8fb73bda5ce43562ecce75abcf59b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8B 11228 bytes