Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2be6a5a3ffc6d49…

MALICIOUS

PDF

43.2 KB Created: 2020-08-06 03:40:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 381139f61f6c0af314c40d04063cb685 SHA-1: cb0dcd2e6ce07e0d38e53466414e38ff10bc3460 SHA-256: c2be6a5a3ffc6d49e0d312de2b17efef2415631ace2c49694c1cf0eac3855474
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to Shopify domains and one specific URL, https://ttraff.cc/pify?keyword=learn+english+speaking+book+pdf, identified as a malicious redirector. This suggests the document's primary purpose is to redirect users to malicious content, likely for phishing or malware distribution. 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.cc/pify?keyword=learn+english+speaking+book+pdf
    • http://files.arkangelcreations.net/uploads/1/3/1/4/131452903/vezemavot.pdf
    • http://files.communication-works.ca/uploads/1/3/0/7/130740231/209be636e2f117a.pdf
    • http://files.stevenlarose.com/uploads/1/3/2/7/132712251/3da3b4db.pdf
    • https://cdn.shopify.com/s/files/1/0432/6473/7448/files/katurumuxelik.pdf
    • https://cdn.shopify.com/s/files/1/0434/0498/4474/files/nekeravivajosot.pdf
    • https://cdn.shopify.com/s/files/1/0434/1560/1314/files/stihl_sso_portal.pdf
    • https://cdn.shopify.com/s/files/1/0428/6028/2023/files/54083886675.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6331/files/9164284864.pdf
    • https://cdn.shopify.com/s/files/1/0434/2749/6087/files/add_two_numbers_linked_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/8154/7428/files/barufutolevozefawoti.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mulobovapu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2648/0295/files/18304530709.pdf
    • https://cdn.shopify.com/s/files/1/0432/2023/8503/files/32066137987.pdf
    • https://cdn.shopify.com/s/files/1/0431/0210/9856/files/kenunofinur.pdf
    • https://cdn.shopify.com/s/files/1/0439/2042/5115/files/29049124482.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_off00005d28.bin
300b0d546336b8110d44b9ae138165cbf52cbcbb57eaaa946bf70cb64947d1ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D28 5448 bytes
font_01_sfnt_off00006f9f.bin
be2e3595ff4efc4ae89d0d533636aeb5852c9803a6a4740b0821b40a29a9485d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9F 3484 bytes
font_02_sfnt_off00007cee.bin
0e312b4438bf8c0f70dd02d1e52876e58b5e3872a26e3d67ddae7800902b93e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CEE 10212 bytes

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