Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd90738b533fb17…

MALICIOUS

PDF

48.1 KB Created: 2020-09-01 01:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25e3ae27e7c0246eb8d524b9ed73da2e SHA-1: 20f3f7de0e3261b11c37a39d3bdf15778a2a35fe SHA-256: cfd90738b533fb17674ef31254f26747636543f0c290d176b7fa0f9df185c37c
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily garbled, contains the text 'Football live scores news apk' and the malicious URL, suggesting a lure for users interested in sports scores. The PDF also hosts a large number of links to other PDFs, likely for SEO poisoning or to distribute further malicious content. 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.ru/wix?keyword=football+live+scores+news+apk
    • https://cdn.shopify.com/s/files/1/0428/0696/8483/files/allshare_cast_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0432/2784/0669/files/99886963725.pdf
    • https://cdn.shopify.com/s/files/1/0429/5625/9491/files/ronuwinamebekedazujoti.pdf
    • https://static.usrfiles.com/ugd/5ecadc_ecfaee286928403cbc969fbe017b354b.pdf
    • https://static.usrfiles.com/ugd/b972d5_159e41c6f53c4526b9d4dfcd90ee751f.pdf
    • https://static.usrfiles.com/ugd/b8c837_c61a0aee4fac4d42a7e57be25f962646.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0cc46f18ff542b3bfe17710fee3003e.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sujaxitedidubabupopivup.pdf
    • https://cdn.shopify.com/s/files/1/0434/6285/2761/files/xukowela.pdf
    • https://cdn.shopify.com/s/files/1/0435/9729/9869/files/kebevusojafop.pdf
    • https://cdn.shopify.com/s/files/1/0434/4630/4933/files/89608259274.pdf
    • https://static.usrfiles.com/ugd/cfa91a_dc151f57476f4bb0a741091cf83038f3.pdf
    • https://static.usrfiles.com/ugd/ae15ca_c695d9235fe94f27a789a174c0368a3b.pdf
    • https://static.usrfiles.com/ugd/cafc24_a49d338f3f3b488aa93a9ebbff935ad5.pdf
    • https://static.usrfiles.com/ugd/1df9ea_25b9ef832e73463e9cdca4bc71679251.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_off00005d91.bin
5ed703015f700031607b8c66f788fea1cd4fb83e9b5ab61cda8bf88c16353624		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D91 5240 bytes
font_01_sfnt_off00006f8a.bin
c084b0aada2ace9bce83ea33b4ff5dab2d30faa9c7c501dc98ffc250247a7499		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8A 16204 bytes
font_02_sfnt_off00009e09.bin
f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E09 16144 bytes

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