Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fdbf896fdf7eda9…

MALICIOUS

PDF

45.3 KB Created: 2020-08-23 03:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e71ca0230f7edb371c6835c161d68bb1 SHA-1: 14c766cf26b472deaea6d8b0acdb8e56a3f267c1 SHA-256: 5fdbf896fdf7eda9fcbb9db7970e454315a14c150640b92f9a68cc1c752ade96
170 Risk Score

Malware Insights

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

The PDF contains a lure for a 'personal monthly budget spreadsheet free' which, upon inspection, redirects to a malicious URL. The document body and heuristics indicate a link farm and a malicious redirector, suggesting the primary goal is to lead the user to a compromised site. While no scripts were extracted, the PDF structure and embedded links strongly indicate a phishing or redirection attack.

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.
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/pify?keyword=personal+monthly+budget+spreadsheet+free
    • http://files.burghyart.com/uploads/1/3/1/8/131871772/vevelu.pdf
    • http://files.southeyeclinic.co.uk/uploads/1/3/1/1/131163834/3797369.pdf
    • http://files.lumbercityhardware.com/uploads/1/3/1/3/131380558/4397329.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0633/6924/files/python_string_format_variable_width.pdf
    • https://cdn.shopify.com/s/files/1/0432/9930/7673/files/afc_asian_cup_2019_time_table.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9079/files/44445211534.pdf
    • https://cdn.shopify.com/s/files/1/0433/9993/8211/files/antiphospholipid_syndrome_guideline.pdf
    • https://cdn.shopify.com/s/files/1/0429/9938/2170/files/tunixedogafiguxife.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12457093378.pdf
    • https://cdn.shopify.com/s/files/1/0431/1541/3658/files/business_english_texts_for_reading.pdf
    • https://cdn.shopify.com/s/files/1/0428/7542/0835/files/44710116802.pdf
    • https://cdn.shopify.com/s/files/1/0437/5596/2522/files/45234346757.pdf
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/80976867707.pdf
    • https://cdn.shopify.com/s/files/1/0428/2250/0518/files/2302087564.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_off000071df.bin
1df39392c22d4dc396a4eca1e4a243ca66dd0faddc5d43819a39d0a46f3630bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71DF 5700 bytes
font_01_sfnt_off00008517.bin
b626de2965bac82110164b8f94e650d32a3b7352c630076b35d242fda52cb640		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8517 10344 bytes

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