Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93850ed7ae20a70…

MALICIOUS

PDF

43.2 KB Created: 2020-08-29 02:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eee4934c1a508aa3dc4ec84d3e268df2 SHA-1: 11d3fe9c42f600f58f98b675d4302850f598b484 SHA-256: c93850ed7ae20a70224f7de554b20cf3819a232b2e34c8884311af2ef9f8c4d6
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large number of embedded links, indicative of an SEO spam or phishing campaign. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is ttraff.ru, which is used in conjunction with a keyword that appears to be obfuscated text. The document body contains garbled text but also includes the malicious URL and a large number of benign-looking URLs hosted on static.usrfiles.com, suggesting a link farm or redirection strategy.

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=erdal+demirk%25C4%25B1ran+yerim+seni+%25C3%25B6ss+pdf
    • https://static.usrfiles.com/ugd/b8c837_8d3269b0839740d79e79dbe27f89ce81.pdf
    • https://static.usrfiles.com/ugd/b8c837_62efa845e940446e88105a7eda97732d.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fc8fa00ffa9422d9573937e99067c4f.pdf
    • https://static.usrfiles.com/ugd/b8c837_b30317aaa5564d66978070745cb83036.pdf
    • https://static.usrfiles.com/ugd/b8c837_25543622b9ae4d07bb1ea74336628cf4.pdf
    • https://static.usrfiles.com/ugd/b8c837_275931a6218d46978e50a8921bcc6fe1.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e551826a3394389b3bcb35e37064770.pdf
    • https://static.usrfiles.com/ugd/b8c837_344417b15c694c8ab78c02c761c291cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_09707cfa0bb54c12837234a613fb6263.pdf
    • https://static.usrfiles.com/ugd/b8c837_c156cb0b3be843ce97a3e570bb728c2c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c1920bac43bc4cbc9166c3adc1abea13.pdf
    • https://static.usrfiles.com/ugd/b8c837_195e3f0534ea465ca49fba8be2f43f65.pdf
    • https://static.usrfiles.com/ugd/b8c837_4c38232bcb744ef8919d9fbf7e0ddbee.pdf
    • https://cdn.shopify.com/s/files/1/0439/3838/1992/files/75211832157.pdf
    • https://cdn.shopify.com/s/files/1/0429/1212/0998/files/general_mathematics_formulas.pdf
    • https://cdn.shopify.com/s/files/1/0431/4539/6386/files/luxumejibakekited.pdf
    • https://cdn.shopify.com/s/files/1/0432/1368/4891/files/vovazip.pdf
    • https://cdn.shopify.com/s/files/1/0432/9730/8840/files/53163380188.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000663d.bin
7e64c5e65475fc46409216066cd3d24fc610b26fe4a8305fcfeb74868130c1fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x663D 5480 bytes
font_01_sfnt_off00007899.bin
f7d3862d25b35bdf29980937209f238bd5324bea2b1b3ec3297b409bbe78661c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7899 12124 bytes

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