Malicious PDF — malware analysis report

Static analysis result for SHA-256 9957c6a9cbb1406f…

MALICIOUS

PDF

37.8 KB Created: 2020-08-30 14:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0fb385cc627c69ddf0b0b6f4cd5a036 SHA-1: edad13d4edbc14a0c0950da8ebaed5d429c8568c SHA-256: 9957c6a9cbb1406f7c085fbd7ace517c405c076ccdc760c96ab6d4e16a9b72b4
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.com. The document body contains the text 'Ear rape sound effect' and the malicious URL, suggesting a lure to potentially harmful 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.com/wix?keyword=ear+rape+sound+effect
    • https://cdn.shopify.com/s/files/1/0434/5295/6838/files/59289612117.pdf
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/74426977373.pdf
    • https://cdn.shopify.com/s/files/1/0433/6202/5624/files/pillars_of_eternity_chanter_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/7352/6178/files/roxokivivewopututit.pdf
    • https://cdn.shopify.com/s/files/1/0446/9365/1610/files/gokibefej.pdf
    • https://cdn.shopify.com/s/files/1/0431/3825/2957/files/bcbstx_provider_claim_review_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/0439/4646/files/gajafiwozuwisesewiwuduf.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_30774d2738d2475ca0527ee69c88bd22.pdf
    • https://static.usrfiles.com/ugd/f0f215_d1970be1514a4903beaa50387aa32d82.pdf
    • https://static.usrfiles.com/ugd/b8c837_946e224b9e224da3ba33e5d7e7495b8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_1229d99cadd74615a225a1d4375d81ec.pdf
    • https://static.usrfiles.com/ugd/06497e_3dd630f97bf84374a1efaf92530c2dc7.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3902005ac65449fa4739ab3008de5bf.pdf
    • https://static.usrfiles.com/ugd/34e21e_d19ae8d3a31847b599e54890cf460330.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_off00004983.bin
263b0795021df090a1580bb1bdff9f3d2ef22f162cc62ff4b656feae396b661f
pdf-font-stream PDF embedded font (sfnt) at offset 0x4983 3852 bytes
font_01_sfnt_off000055d7.bin
113693837cb3b1f6bff80b1646bf788b9e57a15024be07221b84b05afc558148
pdf-font-stream PDF embedded font (sfnt) at offset 0x55D7 5072 bytes
font_02_sfnt_off0000672a.bin
2a9ccc43d7400795dc649cc2f4f774347e6ec37efbee2dccf872ba43f69452d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x672A 10216 bytes