Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c08a4717f7885d1…

MALICIOUS

PDF

50.0 KB Created: 2020-08-07 02:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cd22966dba5af07a6a294dde4fdbd8f SHA-1: 60242cfa424a394680704d64d4e46a2cffec528f SHA-256: 6c08a4717f7885d15f78882d12ce92ac265b90697db620578336cfe7cf4b7a1c
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 manipulation tactic. One prominent URL, 'https://ttraff.ru/pify?keyword=ascending+order+program+in+8086+microprocessor+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other Shopify links, indicating an attempt to drive traffic to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=ascending+order+program+in+8086+microprocessor+pdf
    • http://files.merryhillweddings.net/uploads/1/3/1/4/131438449/247fb.pdf
    • http://files.srd.dbbcso.org/uploads/1/3/1/8/131858747/sijulezu_nutif_begubifumelabat_xoniw.pdf
    • http://files.aspiringmindsfw.com/uploads/1/3/0/8/130815095/tokabivovu.pdf
    • http://files.demigodlodge.org/uploads/1/3/1/6/131637357/zogipoturojabonawa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/8394/6401/files/witidodoxosajesoxizuxo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7383/1073/files/zuribemuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/2073/7950/files/91096427187.pdf
    • https://cdn.shopify.com/s/files/1/0434/5085/9670/files/53573013549.pdf
    • https://cdn.shopify.com/s/files/1/0430/6753/9623/files/xegabuvolulasow.pdf
    • https://cdn.shopify.com/s/files/1/0432/1653/5720/files/98354712753.pdf
    • https://cdn.shopify.com/s/files/1/0430/9542/5191/files/54510222960.pdf
    • https://cdn.shopify.com/s/files/1/0427/5778/3718/files/78410937747.pdf
    • https://cdn.shopify.com/s/files/1/0431/0843/4077/files/943911256.pdf
    • https://cdn.shopify.com/s/files/1/0432/8102/3140/files/sezufug.pdf
    • https://cdn.shopify.com/s/files/1/0433/2231/0811/files/nabutovibaxunakazejij.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1634/files/riwilatok.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e0c.bin
e3cdb34c19b0b8be474484176c18f4b6ec30ccae46079c761ffb447ced9f1eab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0C 5628 bytes
font_01_sfnt_off00007105.bin
1f4d14aa6a5ea3a2112cb9ddf8c0b5cc17599f9d54bb394fbe90ebba8abaeb32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7105 11004 bytes
font_02_sfnt_off00009670.bin
f279d8b1b950e48d3a3f31b332c5e4de987a7ce54673908f3e0d62a9f7b224cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9670 16384 bytes
font_03_sfnt_off0000ac25.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC25 4324 bytes

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