Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf85f004318956e…

MALICIOUS

PDF

56.8 KB Created: 2020-09-12 01:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b8fca7eff546204dc9758bf7e33f1d3 SHA-1: 92f12f14aab1d3609eb3cada9f92c71a2d86134d SHA-256: 6bf85f004318956eb3bb1460b2beb3ffef9778c79a985dfbed73ce8ec5fc3abd
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to link farms and one specifically to a known malicious redirector. The presence of a 'download button' heuristic further suggests a lure to trick users into clicking these malicious links. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification strongly indicate malicious intent, likely to download a second-stage payload.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.me/pify?keyword=extent+report+with+all+dependency
    • http://files.careers-nm.org/uploads/1/3/0/8/130813612/370560.pdf
    • http://kevazemot.sgpropertycity.com/uploads/1/3/0/9/130969140/seborajuliraz.pdf
    • http://files.bakedbeerandbreadco.com/uploads/1/3/1/4/131406831/5e2b8f92cf2b.pdf
    • http://files.mrsbscusd.com/uploads/1/3/1/4/131407155/zonutidigobi.pdf
    • http://tejur.sghock.com/uploads/1/3/2/3/132302868/3436268.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0065/9100/files/measuring_up_reading_level_d_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0435/8995/9843/files/sagijuzetijewox.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/voxetevew.pdf
    • https://cdn.shopify.com/s/files/1/0431/6486/0575/files/etude_house_dr._ampoule_dual_mask_sheet.pdf
    • https://static.usrfiles.com/ugd/c4ccc4_203df73910d143609c64b0a4da152550.pdf
    • https://static.usrfiles.com/ugd/529dbf_d06e6e7053d445fe9e48d5c79fdb763c.pdf
    • https://static.usrfiles.com/ugd/de9003_9bb08aedc1e94d449ea6dc5dec7d3b41.pdf
    • https://static.usrfiles.com/ugd/3826db_072045eebb01485e8d939ee35c5a7e92.pdf
    • https://cdn.shopify.com/s/files/1/0447/8101/1093/files/32091073271.pdf
    • https://cdn.shopify.com/s/files/1/0431/7849/2062/files/liwimulikusi.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_off000090bf.bin
388fb19683218e4adc26e49b1f40a99f7b3051f8f0ea5b253df661cc3848b6c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90BF 5204 bytes
font_01_sfnt_off0000a28d.bin
88616baaa9ecac2b7b43decb7e5d7a5d5e1344321b547c41872e9446589438d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA28D 16608 bytes

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