Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b0f72235ea2f3b1…

MALICIOUS

PDF

46.5 KB Created: 2020-08-13 23:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58b786b8e3c8524739f530dd88e504b8 SHA-1: 8b27ea76bcdd0939ed619beb2eebc981b1d922d4 SHA-256: 0b0f72235ea2f3b14279722bccd9f4399bceef8e58d783963fb0fa640b0a75f8
154 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external PDF links, suggesting a link farm designed to distribute malicious content. The primary malicious URL identified is https://ttraff.ru/pify?keyword=choom+choom+chanana+baje+song, which is likely used to redirect users to further malicious sites. The ML classifier also strongly indicated maliciousness.

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=choom+choom+chanana+baje+song
    • http://files.artistginasouthgate.com/uploads/1/3/1/1/131163738/pojokoku.pdf
    • http://files.rachelsvineyardtucson.org/uploads/1/3/1/3/131383664/0714680.pdf
    • http://files.jeffreyscheuerermemorial.org/uploads/1/3/1/6/131637953/gatevutudowizag.pdf
    • http://files.bakesfj.com/uploads/1/3/1/4/131408204/c630533e9b7a489.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0431/3448/4648/files/wubovunodokateneretubuda.pdf
    • https://cdn.shopify.com/s/files/1/0434/1694/4796/files/37860448322.pdf
    • https://cdn.shopify.com/s/files/1/0429/1805/1996/files/dark_souls_2_soul_spear.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/joxemikajawu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3150/2749/files/ruketutanafenififodawiru.pdf
    • https://cdn.shopify.com/s/files/1/0433/3626/9983/files/satyanarayana_biochemistry_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/1376/6296/files/79534728367.pdf
    • https://cdn.shopify.com/s/files/1/0431/0879/4530/files/gozebalavumujom.pdf
    • https://cdn.shopify.com/s/files/1/0429/8014/7359/files/convert_jpg_to_vector_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/1464/2070/files/gafuforuja.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/85767039155.pdf
    • https://cdn.shopify.com/s/files/1/0429/6101/0842/files/liwejegenetaxewifo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fc4.bin
ae4f25fa8af89e53cf064c69964e4df68d8b04162851654c3b35462ba6b3cae4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC4 5204 bytes
font_01_sfnt_off0000715d.bin
a60e0601a31c5ab7d8519b20a1701f690330218a206cffe0f1acb57a621a221c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x715D 14920 bytes
font_02_sfnt_off0000a059.bin
4ec9c7beba50956a9728688adc38dc975961b47a86a0610f027f4e065074693e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA059 3128 bytes

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