Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b814c12aab151d…

MALICIOUS

PDF

40.2 KB Created: 2020-08-14 18:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 083b87c8d3300671da50d93fbc7c39c1 SHA-1: 3517250ca4b131306dae596bf17fe9142338deac SHA-256: 10b814c12aab151d2abdcc9b6974bf4c5dda152d2041d7489b9c7b7208e69566
162 Risk Score

Malware Insights

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

The PDF contains multiple links, including one pointing to a known malicious redirector. The document body and heuristics indicate a lure to click a download link, likely leading to a malicious site. The presence of numerous external links suggests a link farm SEO tactic to obscure the malicious destination.

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.com/wb?keyword=convert%20jpg%20to%20searchable%20pdf%20online
    • http://files.stuartcrouch.net/uploads/1/3/2/6/132695428/4416860.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/letobugivojofifegadijap.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7616/files/binakilorelej.pdf
    • https://cdn.shopify.com/s/files/1/0440/9065/4885/files/luzewumomoma.pdf
    • https://cdn.shopify.com/s/files/1/0429/1231/7603/files/basel_iii_finalising_post-_crisis_reforms_summary.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sejil.pdf
    • https://cdn.shopify.com/s/files/1/0437/2535/7206/files/bolimokuvukilopo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9627/6128/files/zafiwozugapulafuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/1355/4855/files/lobiwonowinofajimoma.pdf
    • https://cdn.shopify.com/s/files/1/0434/7379/7285/files/43390759225.pdf
    • https://cdn.shopify.com/s/files/1/0429/6510/6847/files/72954239862.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/90763225981.pdf
    • https://cdn.shopify.com/s/files/1/0436/3950/5054/files/adada_malada_song_free.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_off00005e0c.bin
70228da6e349ae8cc564b2d125fe11f96b7b6c5e742282f58df60a5a8881401d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0C 5600 bytes
font_01_sfnt_off00007117.bin
1e3c947a4538a48220a8737f1240c9f02dc28242281794b6da2cdd01c4eb2861
pdf-font-stream PDF embedded font (sfnt) at offset 0x7117 10308 bytes