Malicious PDF — malware analysis report

Static analysis result for SHA-256 836135f01d47da38…

MALICIOUS

PDF

58.4 KB Created: 2020-08-06 22:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b01339450b0e646e66e91d1e596b8bd0 SHA-1: eb92983f001738b56a2f82aa82436cba0315df27 SHA-256: 836135f01d47da3852d07f804251653b4fd73ae786f93f0c1e3feb455a277ab8
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL which is likely intended to trick the user into downloading further malicious content. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=digital+art+tutorial+pdf
    • http://files.aimeetayagphotography.com/uploads/1/3/2/6/132682897/51936bf20e9aa2a.pdf
    • http://files.piommiami.org/uploads/1/3/0/7/130740375/lareleris_daperubuwaxeji_fimixajitiv_waninekadirepu.pdf
    • http://files.pjuncaged.com/uploads/1/3/1/1/131164295/4984955.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4741/1096/files/29555270973.pdf
    • https://cdn.shopify.com/s/files/1/0429/0809/0535/files/sojixoxepasotuxokaxugipe.pdf
    • https://cdn.shopify.com/s/files/1/0428/5772/6118/files/kukajegalabaloju.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/american_pie_sheet_music_piano.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2131/files/balkan_wars_1912_13.pdf
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/6346698615.pdf
    • https://cdn.shopify.com/s/files/1/0432/1555/2674/files/nepesowafoluzafane.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dedagefegumam.pdf
    • https://cdn.shopify.com/s/files/1/0430/7487/9641/files/tilireriwite.pdf
    • https://cdn.shopify.com/s/files/1/0430/2720/2205/files/acrobat_reader_pro_komprimieren.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zikoraj.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_off0000a679.bin
80be5b77b2ebad26104e008b09374d504be3d533f5ac104a503193912d35485e
pdf-font-stream PDF embedded font (sfnt) at offset 0xA679 5028 bytes
font_01_sfnt_off0000b7ae.bin
9a174d06400733da0ee691354b1942a5213f71286f07752a910584325b6b8124
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7AE 10748 bytes