Malicious PDF — malware analysis report

Static analysis result for SHA-256 237b31b84346d350…

MALICIOUS

PDF

47.2 KB Created: 2020-08-27 20:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaa1933937cd5e679de9356c289ea9b5 SHA-1: 327d55fa09d6f2f0861f4af49c0369ec985fe195 SHA-256: 237b31b84346d350d6cf162556e869e370ac326cd6412f0cc04e9d3b9120c0a9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm designed to mimic search engine results, directing users to download files. The primary malicious link, https://ttraff.ru/pify?keyword=braveheart+full+hd+movie+free+downlo, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to movie downloads, reinforcing the lure. The ML classifier 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.ru/pify?keyword=braveheart+full+hd+movie+free+downlo
    • http://mopow.trailbalzingamstaffs.net/uploads/1/3/0/7/130775162/df67895e.pdf
    • http://files.bwwgs.org.uk/uploads/1/3/1/4/131453045/546244.pdf
    • http://files.alphachichico.org/uploads/1/3/0/7/130775953/nakuda-vuwoxola-paxeminafijod.pdf
    • http://urlca.com/174m2i
    • https://cdn.shopify.com/s/files/1/0431/2042/7157/files/file_manager_hd_latest_apk.pdf
    • https://cdn.shopify.com/s/files/1/0433/4170/9462/files/kosed.pdf
    • https://cdn.shopify.com/s/files/1/0431/6410/6909/files/62704822426.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7431/files/nevema.pdf
    • https://cdn.shopify.com/s/files/1/0436/4333/8912/files/satonozala.pdf
    • https://cdn.shopify.com/s/files/1/0427/8219/5879/files/fopepituga.pdf
    • https://cdn.shopify.com/s/files/1/0438/0485/2386/files/pokemon_battle_frontier_full_episodes.pdf
    • https://cdn.shopify.com/s/files/1/0440/5886/9910/files/69822289393.pdf
    • https://cdn.shopify.com/s/files/1/0435/1049/7434/files/sw_kotor_mod.pdf
    • https://cdn.shopify.com/s/files/1/0428/6709/7756/files/bioshock_infinite_dlc_achievement_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/2752/8861/files/arquitectura_de_computadoras_segmentada.pdf
    • https://cdn.shopify.com/s/files/1/0432/1230/8637/files/makkar_ielts_speaking_2020_may.pdf
    • https://cdn.shopify.com/s/files/1/0431/1161/2572/files/android_tv_stick_hdmi_cec.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ce9.bin
7e64d644d93b7bbae5d32fc5384029c9676c4ce1b6a7bc87d9a2717b23f465b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE9 5052 bytes
font_01_sfnt_off00007dff.bin
c9c8d3dd82d41a3bf039fdbfa8d9614886ab39aa3dca4245ac0aa5a92e131b35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DFF 10396 bytes
font_02_sfnt_off0000a172.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA172 4324 bytes

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