Malicious PDF — malware analysis report

Static analysis result for SHA-256 422137c55275bf3f…

MALICIOUS

PDF

44.9 KB Created: 2020-08-15 08:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04fb40f0580f25a1bcfad7f2cfd24ff5 SHA-1: 687210eb7be4f8158808bc408a09fc3c963873b7 SHA-256: 422137c55275bf3fe40802d5a9c9d1999e7a93ac5403c8dac7da661f34247ce3
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a critical redirector link pointing to ttraff.cc, indicating a phishing or malicious redirection attempt. The document body, though malformed, contains the same URL, reinforcing the malicious intent. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the presence of a malicious redirector URL is a strong indicator of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wb?keyword=short%20stories%20in%20german%20for%20beginners%20pdf%20olly%20richards
    • http://files.delmardogs.com/uploads/1/3/0/7/130739971/pasupu_fapigugusemaja.pdf
    • http://xuxuz.triceceramics.com/uploads/1/3/0/7/130775388/4977704.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/7913659608.pdf
    • https://cdn.shopify.com/s/files/1/0434/6960/2978/files/12283249977.pdf
    • https://cdn.shopify.com/s/files/1/0433/9538/3446/files/tobibutafuwisuxoxuwe.pdf
    • https://cdn.shopify.com/s/files/1/0430/7625/5897/files/vowumajuwemakarorisiwumu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7854/1727/files/brain_injury_journal.pdf
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/boratawutawisaxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96226605796.pdf
    • https://cdn.shopify.com/s/files/1/0449/9125/0591/files/infrastructure_as_a_service_iaas.pdf
    • https://cdn.shopify.com/s/files/1/0437/1798/4405/files/77359198767.pdf
    • https://cdn.shopify.com/s/files/1/0432/0601/7186/files/zafomesudopukuwilipabogu.pdf
    • https://cdn.shopify.com/s/files/1/0436/1594/4867/files/across_the_bridge_novel.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_off00006fb6.bin
a4925b172e64ecd7b5433c23c29fd36149be1ae10c28e69fc94990a1c4610f23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB6 5912 bytes
font_01_sfnt_off000083a9.bin
bfdd3642d5017ee78eb86f6e17df968c374ef6e9910458bf954e267ea1a13c14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83A9 10240 bytes

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