Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84f97be647b69dd…

MALICIOUS

PDF

45.9 KB Created: 2020-08-30 15:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 275af49418d19a5533c9ae934cf72bbf SHA-1: bad0668550ae1bc9aa18d4095d1ccc1e8bae53d2 SHA-256: a84f97be647b69dd32a6693265b58da97345d5f5b5ca116e850a79bc89de6a93
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, which is characteristic of SEO spam or link farms. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to deliver malware or facilitate phishing. The document body, though heavily obfuscated, contains the string 'ilok crack mac' and the malicious URL, suggesting a lure for cracked software. The ML classifier strongly supports the malicious nature of this PDF.

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/wix?keyword=ilok+crack+mac
    • https://cdn.shopify.com/s/files/1/0431/2324/5216/files/85552018716.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2836/files/91300510553.pdf
    • https://cdn.shopify.com/s/files/1/0440/7299/2918/files/fuzesaremepiteb.pdf
    • https://cdn.shopify.com/s/files/1/0433/7251/1386/files/57946232239.pdf
    • https://cdn.shopify.com/s/files/1/0430/6596/6754/files/12772707302.pdf
    • https://cdn.shopify.com/s/files/1/0434/7405/9426/files/71490824629.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7500/files/ruvobevemolubovasiza.pdf
    • https://cdn.shopify.com/s/files/1/0434/0331/3315/files/wijaruv.pdf
    • https://cdn.shopify.com/s/files/1/0435/7141/3151/files/35974458747.pdf
    • https://cdn.shopify.com/s/files/1/0435/8022/7747/files/kamitenumofodonefig.pdf
    • https://cdn.shopify.com/s/files/1/0440/0683/4334/files/mathswatch_answers_multiplying_fractions.pdf
    • https://static.usrfiles.com/ugd/7f46b5_9c37894b11b94308a758c3afe1bc5677.pdf
    • https://static.usrfiles.com/ugd/96768c_aa26adf6075a4adcb0153b65783ede33.pdf
    • https://static.usrfiles.com/ugd/cb5dea_0871c73382e84ee59377989e342af736.pdf
    • https://static.usrfiles.com/ugd/5af86b_a4b4731aa34d4b12a8783afa326a00eb.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007678.bin
4f022c467e6ae0b0df88f74dc3333db338fbed199098a8d6f934e2fce8fc63bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7678 4768 bytes
font_01_sfnt_off0000868a.bin
dc0a772115c30c453cd521073ed86eec43e103287c5a602a4fdade93a836fed5
pdf-font-stream PDF embedded font (sfnt) at offset 0x868A 10796 bytes