Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ce6e3d300d51c3…

MALICIOUS

PDF

95.1 KB Created: 2020-08-13 01:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1520bdf3ccc59d93f137a4bfca7773fb SHA-1: 6316963112e327df1ae8e316f2da41f4771602f9 SHA-256: b8ce6e3d300d51c3bceff822e9fc8f4f69cab0aba3bc381d1bf61e8505ca1c3e
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely intended to lead the user to a phishing or malware download site. The document body, though heavily obfuscated, contains the same redirector URL. The presence of a link farm and the ML classifier firing further support malicious intent. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/pify?keyword=aspiration+pneumonia+%25E0%25B8%2584%25E0%25B8%25B7%25E0%25B8%25AD+pdf
    • http://jusejuz.saud.solutions/uploads/1/3/1/4/131410685/lavujamoben.pdf
    • http://files.uncommongoodcollective.org/uploads/1/3/1/0/131070487/cfec9b3e8c0471.pdf
    • http://files.nbmarysville.org/uploads/1/3/1/6/131606201/vamugubodowit.pdf
    • http://detidujeb.youthinequalityjustice.org/uploads/1/3/1/3/131384082/kigafiwuf.pdf
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/75937334773.pdf
    • https://cdn.shopify.com/s/files/1/0430/7487/9641/files/rovozalemadolatelaja.pdf
    • https://cdn.shopify.com/s/files/1/0427/8157/3279/files/simeloxeraw.pdf
    • https://cdn.shopify.com/s/files/1/0435/2901/1359/files/basic_functions_of_ms_excel.pdf
    • https://cdn.shopify.com/s/files/1/0433/0510/7620/files/43914479670.pdf
    • https://cdn.shopify.com/s/files/1/0440/1581/2766/files/english_old_norse_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0431/7881/9735/files/75529158708.pdf
    • https://cdn.shopify.com/s/files/1/0429/3260/0985/files/fugabebosezivol.pdf
    • https://cdn.shopify.com/s/files/1/0432/4032/5282/files/vukurakisirefozaxunipoze.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00010061.bin
72306a372b02f9adc88ef2e893b28ee3360ec7eaf9ca02df2d997ea786eeea4c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10061 17600 bytes
font_00_sfnt_off0000df76.bin
fbb4d3256de20f42c3a554b44152925e7eb11a2bbf31e57226ef41ccc72c7382		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF76 5028 bytes
font_01_sfnt_off0000f065.bin
e03d3b8c71436d1606c43b02615845da980993065cea919b1251dbbbae8c5612		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 6180 bytes
font_03_sfnt_off00013029.bin
99cf53b314223f37b2b2a13960bc0a2a396b39223bbb3f791fb40cf2e64c1b85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13029 14776 bytes
font_04_sfnt_off00015e98.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E98 4324 bytes

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