Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1409518b1a9961e…

MALICIOUS

PDF

47.7 KB Created: 2020-09-04 14:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc9a2695c1846155d60127d3e2c81402 SHA-1: a01c488aa2238775e9bea2bf98c305f904e0b944 SHA-256: f1409518b1a9961ebc5416ad03f0d23dde7bf52025a54aa88604b12472e2752c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains a malicious redirector link disguised as an 'enquiry form template'. The link, https://ttraff.me/wix?keyword=enquiry+form+template+in+html, is a known malicious URL. The document also contains a large number of external PDF links, many hosted on Shopify, which is indicative of a link farm used for SEO poisoning or to obscure the final malicious destination. 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.me/wix?keyword=enquiry+form+template+in+html
    • https://cdn.shopify.com/s/files/1/0432/8731/4590/files/bafg_bayern_formblatt_5.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/pasufibijaxipifoger.pdf
    • https://cdn.shopify.com/s/files/1/0437/3712/0933/files/pelebifefefokatugokaroxu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0695/0550/files/48962421751.pdf
    • https://cdn.shopify.com/s/files/1/0431/1177/6416/files/5212147331.pdf
    • https://cdn.shopify.com/s/files/1/0437/9728/2977/files/linopediruxeza.pdf
    • https://cdn.shopify.com/s/files/1/0435/6171/3813/files/asphalt_xtreme_pc_windows_8.pdf
    • https://cdn.shopify.com/s/files/1/0437/2958/4293/files/xokuzuwiku.pdf
    • https://cdn.shopify.com/s/files/1/0428/4219/4083/files/certificate_of_origin_form_b_china.pdf
    • https://cdn.shopify.com/s/files/1/0434/1999/2222/files/lemik.pdf
    • https://static.usrfiles.com/ugd/de9003_19543bca9efe488489a0f1d561d2bfaf.pdf
    • https://static.usrfiles.com/ugd/756799_eb330cd7fcba4a399d53b7983bda5adc.pdf
    • https://static.usrfiles.com/ugd/b80405_c54567f5eecb40799afc7e50f4857e6e.pdf
    • https://static.usrfiles.com/ugd/08e331_b838b5d2899d4682b553fd6a10d573af.pdf
    • https://static.usrfiles.com/ugd/536122_9196bb3795764298814ecf119f234852.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_off000070ce.bin
2c73c1e55f420cfbf9e605f5ea33ae13dce239334a45e9f92253a3d50594a1ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70CE 5032 bytes
font_01_sfnt_off000081c2.bin
a2b4846cd1724e176e879e019d6d8509c7c80f83acc5eb42b6166901d0750f73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81C2 10024 bytes
font_02_sfnt_off0000a407.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA407 4324 bytes

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