Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc95d877e54c791…

MALICIOUS

PDF

40.1 KB Created: 2020-09-02 06:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d09d27dfb1520e215e5f8df7e9732e67 SHA-1: 824363c28dfdcb292ec3d5091bfca27cf2e739da SHA-256: 9fc95d877e54c791b800ff7ed6d932e3aefe4c3027e48675bafa3ea0cec382a0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.me'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of numerous other links to Shopify, while marked as benign, indicates a link farm strategy, likely to improve SEO for malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=dog+star+arthur+c+clarke+pdf
    • https://cdn.shopify.com/s/files/1/0434/5282/5767/files/nisiranegemagojowupe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/learn_english_language_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/5650/4744/files/30505162253.pdf
    • https://cdn.shopify.com/s/files/1/0434/1792/7837/files/tegurew.pdf
    • https://cdn.shopify.com/s/files/1/0430/1081/8201/files/dissolution_bioavailability_and_bioequivalence_abdou.pdf
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/nutafanajaruvu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7103/6835/files/99011782536.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/maxulozimaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/e2_80_9csaebba_e2_80_9d.pdf
    • https://cdn.shopify.com/s/files/1/0434/4152/0790/files/niwopuferibaluwinizowe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6931/7020/files/36034225579.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2339/files/judubipurajupevidese.pdf
    • https://cdn.shopify.com/s/files/1/0438/6524/3813/files/54196262465.pdf
    • https://static.usrfiles.com/ugd/19ce5d_a78233414a134a8192cc3732a62f902e.pdf
    • https://static.usrfiles.com/ugd/824332_85979c528f40420b9db31d7c2c10e0b8.pdf
    • https://static.usrfiles.com/ugd/665c20_3a1816186fb249279f8a4289e09708e9.pdf
    • https://static.usrfiles.com/ugd/0aab01_d81a443469d349888551d8f869e70c78.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_off00005d6b.bin
2a67dc8aab5343430893c65ca1a58201f9599eb5e1790bc7a5c819e2b166342f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6B 5480 bytes
font_01_sfnt_off0000701b.bin
8fdeb1b4ba0b062a24d864f6e91d1a915edbc28f7dd0107398e9b77e234e2688		 pdf-font-stream PDF embedded font (sfnt) at offset 0x701B 10272 bytes

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