Malicious PDF — malware analysis report

Static analysis result for SHA-256 d687706b3b0a1bd7…

MALICIOUS

PDF

43.7 KB Created: 2020-07-15 19:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb80be3b58a104163eddf7de0eb5fe91 SHA-1: 6bf5eed712b3d60616a7e83a5c1dd13876c4ded6 SHA-256: d687706b3b0a1bd701b0941fa8843948970b8824dbd1648fa956891f0e0e3511
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm'. This suggests the document's primary purpose is to host numerous external links, likely for SEO manipulation or to redirect users to malicious sites. The presence of a known malicious redirector link further supports this assessment.

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/wb?keyword=physics%20gre%20solutions%20pdf
    • http://files.downcassiereeroad.com/uploads/1/3/0/8/130814066/tixazabom.pdf
    • http://files.mosaiqc.eu/uploads/1/3/1/4/131406982/jegozivib_lidabofozeg.pdf
    • http://files.i3study.org/uploads/1/3/0/7/130775607/xusumawexilo.pdf
    • http://files.freshrescue.com/uploads/1/3/1/3/131398357/2325814.pdf
    • http://files.capital-p-services.co.uk/uploads/1/3/2/6/132683040/nidomozarotix_xokexa.pdf
    • http://files.aliciaburdess.com/uploads/1/3/1/4/131408788/vagonudomuta-minupeb.pdf
    • http://files.magentadreams.site/uploads/1/3/1/6/131606819/99c8ef4df01c5b1.pdf
    • http://files.starboycreations.com/uploads/1/3/1/4/131453245/gujubumuwemub.pdf
    • http://files.miscoehillpto.org/uploads/1/3/1/4/131409055/jakitujuferefon.pdf
    • http://files.starboycreations.com/uploads/1/3/1/4/131453245/gujubu
    • https://jujiromupap.files.wordpress.com/2020/07/85568599257.pdf
    • https://bemesum.files.wordpress.com/2020/07/23088215714.pdf
    • https://wosexazori.files.wordpress.com/2020/06/wumip.pdf
    • https://kedisufod.files.wordpress.com/2020/06/97349877739.pdf
    • https://cdn.shopify.com/s/files/1/0431/8868/2915/files/961900536.pdf
    • https://cdn.shopify.com/s/files/1/0427/9946/4611/files/5364159825.pdf
    • https://cdn.shopify.com/s/files/1/0427/7737/8972/files/34566494060.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xasojikunu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/faxusumowavunisipor.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/janovi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fovurasavelibegesixaga.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_off000069ac.bin
fca1c1c89e2e856da6d05353c46910be8598bfac4a16c13f7c0e340d145c7809		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69AC 5192 bytes
font_01_sfnt_off00007b4a.bin
8b2e010a1b2b07a0d3b527f4b31258b9345d6c84ee36cab26552e3ddad8c3601		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4A 11180 bytes

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