Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e527029dce7521…

MALICIOUS

PDF

41.5 KB Created: 2020-08-22 06:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b804f733f807ee3250681f8912836c9 SHA-1: 1fd75d89421e2a7c7c7b63aa59b9fd6ed546bdc9 SHA-256: b6e527029dce7521225061d3028f6939315704b499e9c9b1b09ffb2ba2245043
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains the same URL and references to 'Beyonce knowles songs', suggesting a lure to entice clicks. The presence of numerous links to external PDFs, many hosted on Shopify, indicates a link farm strategy, potentially for SEO poisoning or to host further malicious content. The ML classifier strongly flagged this PDF as malicious.

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.cc/pify?keyword=beyonce+knowles+songs
    • http://wenisumak.galescreekchurch.com/uploads/1/3/1/4/131483281/migutorakupoza.pdf
    • http://niwakuzo.rock-n-water.com/uploads/1/3/1/4/131438044/3036214.pdf
    • http://vodexuv.sarahsheppardsart.com/uploads/1/3/2/6/132683289/526a19.pdf
    • http://radira.nwcwc.net/uploads/1/3/2/7/132740270/zumimo.pdf
    • http://files.pubpronetworkconference.com/uploads/1/3/1/3/131379776/3594370.pdf
    • https://cdn.shopify.com/s/files/1/0440/7335/3381/files/40026603296.pdf
    • https://cdn.shopify.com/s/files/1/0431/9602/2933/files/46421343840.pdf
    • https://cdn.shopify.com/s/files/1/0450/7457/9608/files/bartleby_herman_melville.pdf
    • https://cdn.shopify.com/s/files/1/0432/1656/8482/files/tazezodepilujivababu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7744/3483/files/mixelafusesi.pdf
    • https://cdn.shopify.com/s/files/1/0427/9028/9574/files/51665215419.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8190/files/botutubezagigi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53741046047.pdf
    • https://cdn.shopify.com/s/files/1/0437/5019/5354/files/mother_s_day_coupon_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/8305/4757/files/98276589341.pdf
    • https://cdn.shopify.com/s/files/1/0429/6956/3290/files/43221729987.pdf
    • https://cdn.shopify.com/s/files/1/0434/4076/7132/files/import_google_font_stylesheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7645/files/service_manual_for_whirlpool_cabrio_washer.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_off000065ca.bin
22ea79b93ad472323f47810541094f56a3446a04108ea48b4803d7241b0aad62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65CA 4968 bytes
font_01_sfnt_off000076ed.bin
9d9518abd5a5b0c32fbf76e64ae3e3b8f7a8dcd7f257fbfa2d209402069a4264		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76ED 10076 bytes

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