Malicious PDF — malware analysis report

Static analysis result for SHA-256 1766041a56847003…

MALICIOUS

PDF

41.2 KB Created: 2020-08-10 22:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec0ca865d79d5614155e7f1ac71dc237 SHA-1: da8765fa13f24b97e7415be685ee60fff0b27c4b SHA-256: 1766041a568470039dd8a0043d35e79ae752ab9d75ab680ae7f77128a29c4c26
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation or to obscure malicious redirects. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.cc/pify?keyword=agile+project+management+with+scrum+ken+schwaber+pdf`. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to lure users to malicious content. No scripts were extracted from this sample.

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=agile+project+management+with+scrum+ken+schwaber+pdf
    • http://files.rachelsvineyardtucson.org/uploads/1/3/1/3/131383664/0714680.pdf
    • http://bibewigom.hitthome.net/uploads/1/3/1/4/131438800/5932560.pdf
    • http://files.idahoflyer.us/uploads/1/3/1/6/131636930/842ab7a2c1.pdf
    • http://files.growinhim.org/uploads/1/3/1/0/131070820/891126.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wiwatubaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/7455/9893/files/78804670238.pdf
    • https://cdn.shopify.com/s/files/1/0430/7946/7170/files/31937982586.pdf
    • https://cdn.shopify.com/s/files/1/0431/1613/4562/files/40119075158.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/zekavisodado.pdf
    • https://cdn.shopify.com/s/files/1/0428/6958/8124/files/22892397609.pdf
    • https://cdn.shopify.com/s/files/1/0428/6713/0534/files/78359919632.pdf
    • https://cdn.shopify.com/s/files/1/0432/2131/9839/files/standard_deviation_formula_with_example.pdf
    • https://cdn.shopify.com/s/files/1/0451/7367/0037/files/b_pharmacy_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0430/0416/6297/files/rabiretefabababoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/3686/8762/files/dobatitafutiretuko.pdf
    • https://cdn.shopify.com/s/files/1/0430/4922/2298/files/lizuwulalev.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006118.bin
466d5b403a567b406267c24679de20278b17bf81f5fd3eb7044410bb60aa2ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6118 5928 bytes
font_01_sfnt_off00007521.bin
31585268ec16f5b0257ea1882700f1626e51c370b6784f14e50690ac10478eb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7521 9936 bytes

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