Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c6cbe18e462457…

MALICIOUS

PDF

40.5 KB Created: 2020-08-09 06:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8eab8dde9dba82d1b23f167c4e8d356 SHA-1: b2de016ab430ee9ce15129d06e2940f76dc4d08d SHA-256: 92c6cbe18e4624576ed097b04cf3a382261912621b68e50723036aa9305011c1
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though obfuscated, contains text related to a 'Hogwarts acceptance letter printable pdf' and the malicious redirector URL. The PDF_SEO_LINK_FARM heuristic suggests the PDF is part of a link farm, likely for SEO manipulation or to distribute malicious links. The ML classifier also strongly flagged this PDF as malicious.

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=hogwarts+acceptance+letter+printable+pdf
    • http://zifidu.actforveterans.org/uploads/1/3/0/8/130874359/31d2856.pdf
    • http://files.malcolmmcewan.com/uploads/1/3/0/7/130776632/884f1b0b4c3.pdf
    • http://vosijo.iahbeardenvrai.com/uploads/1/3/2/3/132303382/8679954.pdf
    • http://files.brookwoodlearning.com/uploads/1/3/2/6/132695258/3715178.pdf
    • http://files.eastcoastkubb.com/uploads/1/3/0/7/130740073/7396837.pdf
    • https://cdn.shopify.com/s/files/1/0436/0214/9540/files/pdf_marketing_en_redes_sociales.pdf
    • https://cdn.shopify.com/s/files/1/0430/1602/8309/files/download_holy_bible_in_amharic.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0111/files/41647955463.pdf
    • https://cdn.shopify.com/s/files/1/0443/1645/9164/files/automation_in_clinical_biochemistry_laboratory.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/sepetiluw.pdf
    • https://cdn.shopify.com/s/files/1/0434/6006/7480/files/97612316265.pdf
    • https://cdn.shopify.com/s/files/1/0435/8986/1535/files/lijomo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2971/6374/files/bacchae_woodruff.pdf
    • https://cdn.shopify.com/s/files/1/0427/6781/0726/files/borutadukamip.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/58136641958.pdf
    • https://cdn.shopify.com/s/files/1/0439/2851/8824/files/fallout_new_vegas_redesigned.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84574839703.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5494/files/petafe.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_off00005e0f.bin
b43a42fbbbf5629983b1241d75894d4965642f064d33412530d27c94df183eaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0F 5516 bytes
font_01_sfnt_off000070ef.bin
17d6b43080557638c6b1de87abfdac22e3e6011a916037f151c96046ace3196f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70EF 10612 bytes

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