Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2365d21e8cd6be…

MALICIOUS

PDF

45.6 KB Created: 2020-08-27 15:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5ad0d5029fd2df7b170f5c05eb7b60e SHA-1: 44428977993411573759c759bed1eb4f30f9b6f4 SHA-256: 8b2365d21e8cd6bea00b16965b99d2e7bca30dd9a96dc07d98d5aefd192fe113
154 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains numerous embedded links. One of these links, https://ttraff.ru/pify?keyword=if+the+savior+stood+beside+me+youtub, points to a known malicious redirector. The document body itself is heavily obfuscated and appears to be a lure, containing a mix of seemingly random text and URLs. The presence of a link farm suggests an attempt to distribute malicious content or phishing pages.

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=if+the+savior+stood+beside+me+youtub
    • http://files.mukilteohouseofwax.com/uploads/1/3/2/8/132816096/5998932.pdf
    • http://files.creesbrothersfarm.com/uploads/1/3/1/6/131637240/wifuzugolebavazadane.pdf
    • http://files.wundanookcreations.com/uploads/1/3/1/0/131070192/nasowaneromibefaxewo.pdf
    • http://files.edzyunique3.com/uploads/1/3/2/8/132815207/fopeteme_befilusodi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/vtech_kidizoom_action_cam_180_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/4591/9652/files/95317015907.pdf
    • https://cdn.shopify.com/s/files/1/0433/8050/6791/files/sobajemen.pdf
    • https://cdn.shopify.com/s/files/1/0432/4655/1208/files/dumudipirodujalakogan.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/tonakozupepiseturib.pdf
    • https://cdn.shopify.com/s/files/1/0435/1744/4264/files/kunaputuwigowopu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/vobap.pdf
    • https://cdn.shopify.com/s/files/1/0430/1006/4537/files/2286035152.pdf
    • https://cdn.shopify.com/s/files/1/0435/4949/1359/files/85814943126.pdf
    • https://cdn.shopify.com/s/files/1/0433/3846/5435/files/ruby_true_false.pdf
    • https://cdn.shopify.com/s/files/1/0432/2482/6014/files/87663523200.pdf
    • https://cdn.shopify.com/s/files/1/0433/0982/6213/files/wuzotutokure.pdf
    • https://cdn.shopify.com/s/files/1/0433/7677/1224/files/69262950678.pdf
    • https://cdn.shopify.com/s/files/1/0432/9940/5977/files/moon_knight_warren_ellis.pdf
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/cambridge_english_objective_proficiency.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_off000066e5.bin
fdb9229377fb7d04fabe889f63ae0ee63e64f5250d01c41df53aaaa69013236a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66E5 5132 bytes
font_01_sfnt_off00007865.bin
ec7c8d1a3317e8f62b4076c8793511a987e8ee4c43be285a2eafa74009fb3a7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7865 10120 bytes
font_02_sfnt_off00009afb.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AFB 4324 bytes

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