Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e1653849cea905…

MALICIOUS

PDF

52.0 KB Created: 2020-08-31 13:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec9d3264d79a18cb5185da7cd3655be4 SHA-1: 2121a98d66851ad6e0c9ab8a322ee3e2ac0749a7 SHA-256: f5e1653849cea90531be76c33feeb19b7bf1c6832842377eb873a4edf04335fc
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm designed for SEO manipulation or traffic redirection. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/wix?keyword=numero+cap+merinals'. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious redirector URL and several benign-looking PDF links.

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=numero+cap+merinals
    • https://cdn.shopify.com/s/files/1/0430/0092/2261/files/python_3_string_format.pdf
    • https://cdn.shopify.com/s/files/1/0430/7845/1351/files/nedaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/5098/2805/files/bikopetuvidatipoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/8028/6372/files/98035588585.pdf
    • https://cdn.shopify.com/s/files/1/0459/7311/0951/files/zubuxuvewugasofuxira.pdf
    • https://static.usrfiles.com/ugd/b8c837_61dc039615f94bcd81525e48d6b394d8.pdf
    • https://static.usrfiles.com/ugd/39cb9d_c0243ffaf7c24a05a1c188581cf2a47d.pdf
    • https://static.usrfiles.com/ugd/e23fbb_094fdde7156344949471100564819bca.pdf
    • https://static.usrfiles.com/ugd/b8c837_98a330be0f8a412cbd134df2c0a42fea.pdf
    • https://static.usrfiles.com/ugd/b8c837_f51a4045a515473d84f23bf42b5d6aa6.pdf
    • https://static.usrfiles.com/ugd/362633_43087f7da54549c19a2b7d6b4e3b423b.pdf
    • https://static.usrfiles.com/ugd/0dd040_768c84b0f3c64141b75c7155f4574a12.pdf
    • https://static.usrfiles.com/ugd/eb5a6a_c96be352d46040c4a84ed501ace09061.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3412b6fb3b5451aa6a36a134e74a7df.pdf
    • https://static.usrfiles.com/ugd/dba42a_6f40478755304e11ad7792c5a05465d6.pdf
    • https://static.usrfiles.com/ugd/86319b_fdbab3b84d564f65a774bd962574bbd0.pdf
    • https://static.usrfiles.com/ugd/b914b5_b371fbc294774b08aa69719a42d4e5e7.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_off000077ff.bin
d85056dbf1ed7c3f260b66c7538b50c236698aec01fd898d81f2a6edf63e29f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77FF 4848 bytes
font_01_sfnt_off0000884f.bin
a574ff40fb3e11d5c4b7d18eb7b52dd69fd7eb4ec9a9466213d8463db7f7cfe1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x884F 14168 bytes
font_02_sfnt_off0000b4df.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DF 4324 bytes

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