Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5e2276dff98f78…

MALICIOUS

PDF

67.0 KB Created: 2020-08-02 03:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b53f58bfea73012c6d07235cfb9f462 SHA-1: c7b3fc108906d9b27a51de8ba8968da8be526cba SHA-256: 1d5e2276dff98f78a00cb76948c2f403a07d2e355e9a0523847afa69bdea8fe0
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.cc/pify?keyword=cent+sign+alt+code, is identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector suggests an attempt to lead the user to a harmful site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=cent+sign+alt+code
    • http://files.midnightriderbrts.org/uploads/1/3/1/8/131856285/wikujukoj-tiraxiseru-sumimixugi.pdf
    • http://files.tiffanysews.com/uploads/1/3/1/3/131398164/379009.pdf
    • http://files.treshaimsportfolio.com/uploads/1/3/1/8/131871980/1442450.pdf
    • http://files.dappervintagerentals.com/uploads/1/3/1/3/131398091/tisetowi.pdf
    • http://files.beanoartshop.com/uploads/1/3/2/6/132696018/6270f908330888.pdf
    • https://cdn.shopify.com/s/files/1/0440/8557/5845/files/intermediate_algebra_9th_edition_bittinger_ellenbogen.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66656561998.pdf
    • https://cdn.shopify.com/s/files/1/0437/0333/7115/files/kukudexabezorokizinufuko.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/fonojasome.pdf
    • https://cdn.shopify.com/s/files/1/0435/4323/2661/files/tenakenisiwoxesiburexobak.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/63047206870.pdf
    • https://cdn.shopify.com/s/files/1/0439/3825/0910/files/beery_vmi_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/7650/1147/files/podolomipijuxaxapixemipu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9570/4227/files/mapapox.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/68333177186.pdf
    • https://cdn.shopify.com/s/files/1/0434/9391/6837/files/99321750175.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66083684812.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/embrace_pet_insurance_claim_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/3646/7623/files/75316097052.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006baa.bin
2df9ba33e805bc7dc5cb9ab7fb823e748a0f95c093eaeeecd358baa83262dba1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BAA 6468 bytes
font_01_sfnt_off00007b6f.bin
89102875756de71caf95607888f64fdf1b36cde64f4f210943ce511b2158d369		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B6F 3688 bytes
font_02_sfnt_off0000888c.bin
273245916b16c461587f07467c2fc194b2a73218f280d429782e0f8e99d3236e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x888C 4916 bytes
font_03_sfnt_off0000994b.bin
a33f22cf384843e7d3e060e636c754c65fbef4bde0a69d921202e671b7c19d65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x994B 7176 bytes
font_04_sfnt_off0000b2e4.bin
3c1d2eceab6250a6a4c4ec0436a9788e64320c18c0b057580d3927b1aebf4436		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E4 16192 bytes
font_05_sfnt_off0000e62b.bin
57c74b131b63161cb6f0b8dc0428c5c562a8b842534ff6e86ce875c54da53069		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE62B 16560 bytes

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