Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fab53a50d1f0f69…

MALICIOUS

PDF

51.7 KB Created: 2020-08-31 11:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30e72a6a354249e12ddb54da45e0e63d SHA-1: c13953ff28b959bdb3bff541aadd2dfe65bbf767 SHA-256: 8fab53a50d1f0f69f0a1a3ec92383250cc8f9b6441731ba3b7eb140b7e9164e5
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'ttraff.ru', which is associated with known malicious infrastructure. The document body, though heavily obfuscated, contains text fragments that, when combined with the heuristic firings, suggest a lure related to 'Cloudways download backup sftp'. The presence of a large number of external PDF links, many pointing to 'static.usrfiles.com', indicates a link farm designed to attract search engine traffic, further supporting the malicious redirector's purpose. No scripts were extracted from this sample.

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=cloudways+download+backup+sftp
    • https://static.usrfiles.com/ugd/822ecd_a8169cf738f849c7b3825022f8141b54.pdf
    • https://static.usrfiles.com/ugd/b8c837_8089be3df47d4945b5b6ba07f7465d95.pdf
    • https://static.usrfiles.com/ugd/6da380_9596be9996e446b099a89f2f35ac1c8b.pdf
    • https://static.usrfiles.com/ugd/f1d680_72d8a0a7ef1746e3a642d7766cf40f0c.pdf
    • https://static.usrfiles.com/ugd/5b5da7_b7e1fe21c3c94467a62b98b2a6bb0198.pdf
    • https://static.usrfiles.com/ugd/2274a7_2e3ca6eb1f7349d3b2c131d5dde4e782.pdf
    • https://static.usrfiles.com/ugd/0dd040_b31de0066f7042519c6457cefab12a72.pdf
    • https://static.usrfiles.com/ugd/3f80ec_4b1b9c97f4e046219136ee2632f8693a.pdf
    • https://static.usrfiles.com/ugd/12f4eb_c617921c2ea842ccbd59d611439515c6.pdf
    • https://static.usrfiles.com/ugd/01bc73_67bc8406365f418f868a6b3438c35fc1.pdf
    • https://static.usrfiles.com/ugd/b8c837_559195fe310343769ccc0ecd72120be9.pdf
    • https://static.usrfiles.com/ugd/d17951_de6654903ac445e4886454378176d3c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_932a3e4dac5f4f908cf08eeffd8b4eb4.pdf
    • https://static.usrfiles.com/ugd/c0b427_7ce5c7d797524627a8ad4455846408ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_d57a875f48484ecb9c7ba2770793a251.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a5f.bin
d0cd9f27fef1c57ec9240a3065c7937cda5b1691256cd557be843aabc9a23378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A5F 5356 bytes
font_01_sfnt_off00007cbe.bin
bbbda5c592c8c78e216934855d3df04143aa5c17a7a91f03d1ec57a6aae38a48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CBE 2912 bytes
font_02_sfnt_off00008881.bin
70bb01458d85a486065835e25e4b58caf8b86d1e2fdf1b00149858474b21c144		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8881 10688 bytes
font_03_sfnt_off0000ad1e.bin
9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD1E 16036 bytes

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