Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd5e540065ec6a9…

MALICIOUS

PDF

40.6 KB Created: 2020-08-08 11:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f92d7c0747d1582d5d6e48f56471dd9 SHA-1: 9bbe00d81b05111355e2a9598a80677035b2bb6d SHA-256: 9cd5e540065ec6a9d6be83b0a86aafbb848fdebf2f5ba2c636a6048806a71396
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as search results for a manual, but the primary link redirects to a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and benign-looking URLs, likely to mask the malicious intent. The presence of a link farm and a malicious redirector suggests a phishing or malware distribution attempt.

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.ru/pify?keyword=acer+aspire+5250+manual+pdf
    • http://files.mrsorchard.org/uploads/1/3/0/8/130814980/2ffda75.pdf
    • http://jixiso.kilbucktownship.org/uploads/1/3/1/4/131454012/polutufexerisubokefi.pdf
    • http://files.blueskiesforchildren.org/uploads/1/3/0/7/130775223/pakediteviz.pdf
    • https://cdn.shopify.com/s/files/1/0432/8656/0936/files/how_to_speak_english_fluently_in_easy_way.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/66723311738.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/difogatoxekesujeruwi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0726/2370/files/english_newspaper_word_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0436/3531/0752/files/how_to_download_hls_streaming_video.pdf
    • https://cdn.shopify.com/s/files/1/0435/1806/6842/files/66836101445.pdf
    • https://cdn.shopify.com/s/files/1/0433/2732/4310/files/vifivenaxulokodojegezu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/badunajemojasuganezulok.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93527538138.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_off00004659.bin
4d04e33153047e0ef7355fe7ce9c64a57740989091bfa7ed541b1515f0bb319d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4659 5380 bytes
font_01_sfnt_off0000587c.bin
9e8bd949c16fa4cbb1e22a87b41b187b8d3500721bf78c28c9fdecba096ef0cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x587C 14508 bytes
font_02_sfnt_off000085c3.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85C3 4324 bytes

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