Malicious PDF — malware analysis report

Static analysis result for SHA-256 87aac2840b0bf0cf…

MALICIOUS

PDF

50.3 KB Created: 2020-08-17 16:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7aa90a5e4c283a2d7ff66d70357e319 SHA-1: 6edbbe75d2955fc78ce9693a50681ca7d4acc38a SHA-256: 87aac2840b0bf0cffea7e47039170cea0d3bc261b51e7b3376511f6ef5b20a37
170 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body and heuristics indicate a lure related to invoices or payments, combined with urgency, to trick users into clicking these links. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.com/pify?keyword=first+chief+information+officer+of+kerala
    • http://nizute.sacredplayplace.com/uploads/1/3/0/7/130775403/ff41b.pdf
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102Hussain
    • http://smc.org.inhttp://smc.org.in
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6304/9376/files/zabijadebilinuzewukib.pdf
    • https://cdn.shopify.com/s/files/1/0438/6449/0149/files/full_marks_english_language_and_literature_class_10_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/7001/9998/files/sample_cover_letter_for_ngo_job_application.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/45169097307.pdf
    • https://cdn.shopify.com/s/files/1/0439/3399/1080/files/free_guitar_chords_file.pdf
    • https://cdn.shopify.com/s/files/1/0428/3170/8316/files/effective_technical_writing.pdf
    • https://cdn.shopify.com/s/files/1/0437/9276/0994/files/rimez.pdf
    • https://cdn.shopify.com/s/files/1/0440/8174/1976/files/73813851553.pdf
    • https://cdn.shopify.com/s/files/1/0427/4189/1238/files/61654671422.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9908973296.pdf
    • https://cdn.shopify.com/s/files/1/0429/9092/8026/files/febozusonapumamipoputu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9448/9755/files/42627711660.pdf
    • https://cdn.shopify.com/s/files/1/0435/5178/5109/files/ronodexaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9460/files/74006589901.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/
    • https://gitlab.com/smc/meera/blob/master/COPYING
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00007a53.bin
1c87507e6d12377940ba5bdbe5f7c50ceb5f62bfedefcf3107a71594985fd7a6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7A53 8916 bytes
font_00_sfnt_off00006911.bin
dc565b14d134f7a870fb1f60de7cd51fa3e6630a9eff7bc8193a0f06f2b08a48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6911 5140 bytes
font_02_sfnt_off000098f1.bin
2e6f786f6c76a5695c8a7aec39dc8d2fa7d60e7335bc53f25a31f33406a892ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98F1 10200 bytes

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