Malicious PDF — malware analysis report

Static analysis result for SHA-256 73cfa2bfa8fff3ba…

MALICIOUS

PDF

63.6 KB Created: 2020-08-18 17:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6732b300ce7e991ffe05a9c109897f5 SHA-1: 29a1a40e54ee3bef3f08a32166fa31bdc01e4b47 SHA-256: 73cfa2bfa8fff3bae1295d23f97e667992f6a98abddc106075a576ec2018ba5f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that point to a known malicious redirector, ttraff.cc. The document body, though partially corrupted, suggests a lure related to 'binomial formulas calculator'. The presence of numerous external links, many pointing to Shopify, indicates a potential link farm for SEO manipulation or distributing malicious content. The ML classifier 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.cc/pify?keyword=binomische+formeln+rechner+mit+br%25C3%25BCchen
    • http://files.mariebanville.ca/uploads/1/3/2/6/132683142/jusinuled.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7614/7607/files/nh_dealer_portal.pdf
    • https://cdn.shopify.com/s/files/1/0438/2123/6381/files/69505999369.pdf
    • https://cdn.shopify.com/s/files/1/0437/0399/2474/files/46401566234.pdf
    • https://cdn.shopify.com/s/files/1/0434/7995/7669/files/alleluia_canon_mozart.pdf
    • https://cdn.shopify.com/s/files/1/0429/8371/9071/files/22581689671.pdf
    • https://cdn.shopify.com/s/files/1/0431/3730/2679/files/12358602225.pdf
    • https://cdn.shopify.com/s/files/1/0434/7684/4694/files/employee_resignation_letter_format.pdf
    • https://cdn.shopify.com/s/files/1/0438/9791/3512/files/poradusukuvufo.pdf
    • https://cdn.shopify.com/s/files/1/0438/3683/3952/files/python_selenium_xpath.pdf
    • https://cdn.shopify.com/s/files/1/0429/1536/5031/files/97606312582.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a08e.bin
4d76008045a3e83417b2f19a247eda02190049498045b596d3a3d5a037ee77f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xA08E 5220 bytes
font_01_sfnt_off0000b1ea.bin
182e161721fc598de5af9ebe255ad2610d8a5e5cbd47355870243ff4222c2389
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EA 11836 bytes
font_02_sfnt_off0000d8e1.bin
7ee4b1f8d9baa48174a8df6ee251e4312313c21b6030654781c657e16f36b2b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E1 16364 bytes