Malicious PDF — malware analysis report

Static analysis result for SHA-256 404b695e150051ad…

MALICIOUS

PDF

34.8 KB Created: 2020-08-04 03:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3e0a559e3413d506f31727afca41805 SHA-1: 3b54baceb6b2b1d6e62bc6e1782e3b53bf6a5177 SHA-256: 404b695e150051adb108de0b21b33a3a54c4a10d44018191a0b42452f236c043
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as 'Adonai chords pdf'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the primary malicious URL and numerous other URLs, suggesting a link farm or redirection attempt to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=adonai+chords+pdf
    • http://files.rvadventuresutah.com/uploads/1/3/0/9/130969573/nanejosevuwuv.pdf
    • http://wibuk.blackwellgolf.com/uploads/1/3/0/7/130776760/wefebafo_xufisuj_wejipoderik_rebijoriguge.pdf
    • http://files.shootingcandidly.com/uploads/1/3/1/3/131380944/b8823.pdf
    • http://files.irishwolfhoundsvictoria.com/uploads/1/3/0/7/130739214/ganivenosore.pdf
    • http://files.isfjall.com/uploads/1/3/2/6/132695755/rajukunab.pdf
    • https://cdn.shopify.com/s/files/1/0428/2020/6758/files/30388474226.pdf
    • https://cdn.shopify.com/s/files/1/0431/3828/5725/files/83323954408.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8902/files/posusorudewewatuvaladexe.pdf
    • https://cdn.shopify.com/s/files/1/0430/4453/6473/files/learning_java_through_alice_3.pdf
    • https://cdn.shopify.com/s/files/1/0432/3888/3495/files/zodumibarogowuma.pdf
    • https://cdn.shopify.com/s/files/1/0428/6133/0598/files/best_osu_skins.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/tirodefolibewegomitu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1755/2543/files/19919525920.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5965/files/62889607034.pdf
    • https://cdn.shopify.com/s/files/1/0430/4535/5674/files/berotunazuserogokekuxomi.pdf
    • https://cdn.shopify.com/s/files/1/0427/4041/6678/files/25713231507.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b1c.bin
9cc7da8cf13976d40820a348b5f295866514fdad824b7919682f87e39e3dfc44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B1C 5200 bytes
font_01_sfnt_off00005cc6.bin
bd235dcd12a9a122039f09632e8826f9e2a95151988bcad804aab9fd58242715		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CC6 9852 bytes

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