Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bfbf330d5d8e186…

MALICIOUS

PDF

42.6 KB Created: 2020-08-21 20:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72a5669827bd273861a7ec8718eb64e3 SHA-1: db4936d0c2e1f8cca82c5969f7a6bfa39b5a7d80 SHA-256: 5bfbf330d5d8e186cf8caa74d2f003626b8175de8209350893712699688c08ca
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link farm with 30 external PDF links, one of which redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains the text 'Piano chords app' and the malicious URL, suggesting a lure to download a fake application. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=piano+chords+app
    • http://wisajona.captainmorganssailcharters.com/uploads/1/3/1/4/131408280/pejewijamelesu_metef_vukubujemip_wosap.pdf
    • http://files.sunsandandsilk.com/uploads/1/3/0/7/130739654/6186755.pdf
    • http://nazikisi.1stb.com/uploads/1/3/1/8/131871674/2491243.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/0521/2832/files/bazezukujifukejusaji.pdf
    • https://cdn.shopify.com/s/files/1/0432/3649/1431/files/paula_bruice_organic_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0439/4939/2030/files/84336644029.pdf
    • https://cdn.shopify.com/s/files/1/0429/2273/7830/files/fovad.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/36860427105.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fuwemosuwizukuxitakalav.pdf
    • https://cdn.shopify.com/s/files/1/0436/7784/3609/files/60089624429.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2097/files/18268126679.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/alto_sax_music_sheet_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/7082/5382/files/8053238973.pdf
    • https://cdn.shopify.com/s/files/1/0435/9972/4702/files/nodurukir.pdf
    • https://cdn.shopify.com/s/files/1/0438/8782/0968/files/cakephp_2._x_date_format.pdf
    • https://cdn.shopify.com/s/files/1/0434/6665/3858/files/pusewelakekugodazorejipaw.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_off000067e3.bin
70cec98e9a1f8fc65269b6f64871309a33cf4fc4ce29cc7dc85d2bca69523346		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67E3 5128 bytes
font_01_sfnt_off00007943.bin
0be57d90fc5cbbbdf9c95a4004b05a42c9a8723155815882501ea8ea30830ac4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7943 10676 bytes

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