Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9d6e5d2c20fff4…

MALICIOUS

PDF

49.9 KB Created: 2020-08-21 20:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 856c79f9d9c04ba4788f6390390669c6 SHA-1: 392b192d2df0fe1e82f67a19a75ef75fc4cde62f SHA-256: 5d9d6e5d2c20fff42aab7b2aa52f9bb86ddaf63f7475d5e17dec57844e6317d0
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm and another flagging a redirector link. The primary malicious URL, 'https://ttraff.cc/pify?keyword=b%25C3%25B6hse+onkelz+der+nette+mann', is likely intended to lure the user to a malicious site. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit user interaction for malicious redirection.

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.cc/pify?keyword=b%25C3%25B6hse+onkelz+der+nette+mann
    • http://files.bckamsler.com/uploads/1/3/1/1/131163738/rotarume.pdf
    • http://files.msrhondajwilliams.com/uploads/1/3/2/7/132741535/gasixodub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2670/2758/files/9286598093.pdf
    • https://cdn.shopify.com/s/files/1/0436/4192/9886/files/36790974308.pdf
    • https://cdn.shopify.com/s/files/1/0454/6310/9790/files/angular_2_template_let-_item.pdf
    • https://cdn.shopify.com/s/files/1/0429/5937/2439/files/81227560926.pdf
    • https://cdn.shopify.com/s/files/1/0439/2864/9896/files/gta_online_doomsday_heists_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/2106/5640/files/irs_donation_value_guide_2015.pdf
    • https://cdn.shopify.com/s/files/1/0433/0989/1742/files/34538152935.pdf
    • https://cdn.shopify.com/s/files/1/0428/2440/1063/files/35402116150.pdf
    • https://cdn.shopify.com/s/files/1/0434/9159/0308/files/tilijadeta.pdf
    • https://cdn.shopify.com/s/files/1/0428/7676/4327/files/63771514855.pdf
    • https://cdn.shopify.com/s/files/1/0428/3770/4867/files/79500400662.pdf
    • https://cdn.shopify.com/s/files/1/0437/1641/1547/files/how_to_report_repeated_measures_anova_results.pdf
    • https://cdn.shopify.com/s/files/1/0451/3739/5866/files/traffic_rider_apk_2019_android_oyun_club.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_off00007b4f.bin
1940b08d87a504725ba204db2c708493222a813c189c74ffd9de374b0d85ad78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4F 5368 bytes
font_01_sfnt_off00008d21.bin
88220da4d0f24b20267744d5e6fdffec9b044fc0a27ef7269f4c72951f889f0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D21 13956 bytes

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