Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bfb944104a1411f…

MALICIOUS

PDF

63.4 KB Created: 2020-08-06 22:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a39cedb30ffb6de034c243495944db79 SHA-1: b1b936c4509457acc21b1d26d3f593701bfd3097 SHA-256: 5bfb944104a1411fe76f22a8551ec9c37d47e99394d2ba63f40000c6248ad8fb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that point to a known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with high confidence. The document body, though partially corrupted, contains text related to 'Preparation of activated carbon from rice husk pdf' and a URL that matches the malicious redirector, suggesting a lure to a phishing or malware distribution site.

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=preparation+of+activated+carbon+from+rice+husk+pdf
    • http://files.thechocolatehousedc.com/uploads/1/3/1/3/131379719/worotopomulem_xutuniditobavud.pdf
    • http://files.spiritblossomspsychics.com/uploads/1/3/1/1/131164250/tapan.pdf
    • http://files.brockeyinsurance.com/uploads/1/3/1/3/131379049/9802735.pdf
    • http://files.mw-earrings.com/uploads/1/3/2/8/132814958/1566487.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8748/7385/files/rest_api_doc_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/2576/7320/files/62781330672.pdf
    • https://cdn.shopify.com/s/files/1/0433/1339/7924/files/82307178276.pdf
    • https://cdn.shopify.com/s/files/1/0430/4338/9597/files/xupezukuzomizini.pdf
    • https://cdn.shopify.com/s/files/1/0435/3048/5915/files/bepejutuj.pdf
    • https://cdn.shopify.com/s/files/1/0435/5732/2903/files/highway_engineering_and_traffic_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/33173387963.pdf
    • https://cdn.shopify.com/s/files/1/0434/0485/3402/files/xurakasapogiwef.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/vewufevovojabeniliv.pdf
    • https://cdn.shopify.com/s/files/1/0427/7963/9967/files/95270780462.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_off0000b862.bin
b5389e7b51743fff2e59b6fc10130d23279ae635c479bef27901e73837793272
pdf-font-stream PDF embedded font (sfnt) at offset 0xB862 5628 bytes
font_01_sfnt_off0000cb5d.bin
4f09227bc85096474d461bfaa6abd5c1808ba0112b41a0c626828cc902839e4c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5D 10740 bytes