Malicious PDF — malware analysis report

Static analysis result for SHA-256 7297115eb7cf2a75…

MALICIOUS

PDF

55.1 KB Created: 2020-08-30 20:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e59bff4e624092362d51b307509a66f2 SHA-1: f184c61728a5fe677036bb98cbef2cf77c2ecede SHA-256: 7297115eb7cf2a75c009ba1fe46ca4eccd67feaff56a929e8c56abf98c8ff184
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One of the embedded URLs, 'https://ttraff.ru/wix?keyword=partition+la+le%25C3%25A7on+de+piano', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains this malicious URL.

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=partition+la+le%25C3%25A7on+de+piano
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/8125/0469/files/android_stored_wifi_password.pdf
    • https://cdn.shopify.com/s/files/1/0435/8098/1403/files/wakejunuvifipabi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9372/1255/files/gizewaluwegazafisuvax.pdf
    • https://static.usrfiles.com/ugd/432b07_88300132807b4423a20cfe477d2e251d.pdf
    • https://static.usrfiles.com/ugd/b8c837_fceb8642e2314bf49b72c69d942b1f56.pdf
    • https://static.usrfiles.com/ugd/b8c837_60ac3bd222734e0d8b1566228a9cfecd.pdf
    • https://static.usrfiles.com/ugd/b8c837_e51e4b763c4d4ca480252d4b11fa2a4e.pdf
    • https://static.usrfiles.com/ugd/b8c837_87f48bc106f5460cbcd007b5b9f51007.pdf
    • https://static.usrfiles.com/ugd/b8c837_0422b0f38d414c03b841382b0711e9bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_8901d2675ded4b4db21fc507091c7d55.pdf
    • https://static.usrfiles.com/ugd/d775a9_77256e9b53b94a5c9980cd283df3dbfa.pdf
    • https://static.usrfiles.com/ugd/9c43ec_c1b2852b445a49799649e5d087279ea9.pdf
    • https://static.usrfiles.com/ugd/23e9be_1516dcd64c414240855c3d73cb00b9c5.pdf
    • https://static.usrfiles.com/ugd/b56239_56b9196caf374854b627a2cc9bde5932.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9e3139bcce8430f922dac828fd2f76d.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069fe.bin
36735b497f7db8bf7a9c46464298d39bee844276096bfa70cba70f94846d74db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69FE 3036 bytes
font_01_sfnt_off000074d3.bin
63b1173d96fba4c31ce59e1b6f1292629bc1579057b1507450a1573ffa7049a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D3 4748 bytes
font_02_sfnt_off000084f0.bin
05daee4ed3bc167556466303e534dd995dc7689251a9c2e470768ca87f559b8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84F0 2328 bytes
font_03_sfnt_off00008f27.bin
ff3adc414b9f3f05a604c90a757d40fef72852272a48dc576085301f84e76279		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F27 15692 bytes
font_04_sfnt_off0000bed8.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBED8 4324 bytes

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