Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d592e17c6c3c1a3…

MALICIOUS

PDF

56.3 KB Created: 2020-08-05 01:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 800c8c4c2f86c0fa8ac1be84c2b68e61 SHA-1: 986a66fac0cb4c35574394deab088ec84421890a SHA-256: 5d592e17c6c3c1a354d699367dcf18b74426d4eef5624030acf0431ce7884c6f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The primary malicious URL identified is 'https://ttraff.com/pify?keyword=technical+writing+style+pdf', which likely serves as a lure to further malicious sites. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting a link farm or redirection tactic. The ML classifier strongly supports the malicious verdict.

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/pify?keyword=technical+writing+style+pdf
    • http://files.ugawif.org/uploads/1/3/0/7/130776641/xejawaxovit.pdf
    • http://files.en.handyshop-traiskirchen.com/uploads/1/3/1/4/131453498/4304920.pdf
    • http://files.jenniferdemarestresidential.com/uploads/1/3/0/7/130776805/6537279.pdf
    • http://files.littleiglootree.com/uploads/1/3/1/6/131637365/2033594.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/6116/4697/files/zebumum.pdf
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/how_to_make_a_game_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0436/9140/9562/files/xabawulaga.pdf
    • https://cdn.shopify.com/s/files/1/0437/1025/1176/files/49274038054.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1204107997.pdf
    • https://cdn.shopify.com/s/files/1/0432/1663/4016/files/95428655221.pdf
    • https://cdn.shopify.com/s/files/1/0428/5235/2159/files/poporawivatuja.pdf
    • https://cdn.shopify.com/s/files/1/0428/5785/7187/files/51418748561.pdf
    • https://cdn.shopify.com/s/files/1/0431/0017/6544/files/equations_containing_fractions.pdf
    • https://cdn.shopify.com/s/files/1/0429/5471/9395/files/sufeporazuguxupapukera.pdf
    • https://cdn.shopify.com/s/files/1/0436/3547/4590/files/leniki.pdf
    • https://cdn.shopify.com/s/files/1/0428/1214/5830/files/72820444811.pdf
    • https://cdn.shopify.com/s/files/1/0437/6877/4814/files/62420661248.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_off00009e08.bin
ffb463859f7b2b4501090ea0ef090e3fdda7068bf66ac1630523a9d0f98317c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E08 5560 bytes
font_01_sfnt_off0000b104.bin
e2ae704a181383a571ab69a943315345fecfcd20601f58163e41b1cd9816099b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB104 10224 bytes

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