Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1af6b9731aa830…

MALICIOUS

PDF

41.9 KB Created: 2020-08-17 18:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02007a8d979ca1632549f0564f3a02c1 SHA-1: e4d325c500d86f9ec705fb3c5a4f22cda375d8ad SHA-256: 7f1af6b9731aa83092840f089dbb432ea722f3945095f3fe58eb3e0a36187843
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also flagged this PDF as malicious. The embedded links suggest an attempt to lure users to malicious sites, potentially for phishing or to serve further malware.

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=guide+bce+icaap+ilaap
    • http://lifil.tascdist4.org/uploads/1/3/1/6/131637814/nexawawenawaxiduti.pdf
    • http://files.vtnhcda.org/uploads/1/3/1/4/131452935/fevamokusip-tizibaganojufer-vilak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/1181/3015/files/search_scanned_files_for_text.pdf
    • https://cdn.shopify.com/s/files/1/0428/5323/6902/files/pufatonejezapawizimota.pdf
    • https://cdn.shopify.com/s/files/1/0433/3063/3881/files/ultimate_candida_diet_program.pdf
    • https://cdn.shopify.com/s/files/1/0430/7786/1527/files/68568942130.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/jumbled_up_sentences_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/9807/0426/files/lawozaruzuridi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/14852898376.pdf
    • https://cdn.shopify.com/s/files/1/0430/6377/1293/files/mozafogipez.pdf
    • https://cdn.shopify.com/s/files/1/0432/4353/6541/files/38645900826.pdf
    • https://cdn.shopify.com/s/files/1/0432/6260/7518/files/99528973532.pdf
    • https://cdn.shopify.com/s/files/1/0428/4363/5879/files/kelejajotixuguzar.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_off00006887.bin
22aea7a3bfab09c77df1a0539be3ac0a862fcf01ff18d9fb0d26194d250e1034
pdf-font-stream PDF embedded font (sfnt) at offset 0x6887 4964 bytes
font_01_sfnt_off0000796f.bin
3abfa54a95d3e7721b45e3f9917503c0c13ccda3f58d3531c17b3d8a928f6b12
pdf-font-stream PDF embedded font (sfnt) at offset 0x796F 9804 bytes