Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e9b2c561ae6677…

MALICIOUS

PDF

43.9 KB Created: 2020-08-20 12:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22dcaf3fead876042da37bcda032cdb8 SHA-1: 962f0f0ddae8ed2c470efdcf7038798dc28803e2 SHA-256: 83e9b2c561ae6677548bd979691b000319f4bdac3744e60bc058d5eea9b30a49
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=equivalent+fractions+5th+grade+free+worksheets', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and a list of other PDF links, suggesting a link farm or redirection tactic. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful content.

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.ru/pify?keyword=equivalent+fractions+5th+grade+free+worksheets
    • http://files.datumfoundation.org.uk/uploads/1/3/0/8/130873932/vulugu.pdf
    • http://files.elisehilderphotography.com/uploads/1/3/2/6/132682745/vuvijis_nimotevo_mumoxotegazopab_lapata.pdf
    • http://files.facethecolour.com/uploads/1/3/2/6/132695828/vagevarizavamezujez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6821/8780/files/myfriendshotmom_julia_ann.pdf
    • https://cdn.shopify.com/s/files/1/0431/9540/0356/files/71877509659.pdf
    • https://cdn.shopify.com/s/files/1/0430/5531/7149/files/wimudavidonisalav.pdf
    • https://cdn.shopify.com/s/files/1/0438/3657/1805/files/30760596201.pdf
    • https://cdn.shopify.com/s/files/1/0435/2871/6439/files/gusoti.pdf
    • https://cdn.shopify.com/s/files/1/0438/1717/3149/files/cotton_vs_pima_cotton_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0440/0293/4942/files/birthday_images_hd_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/7405/0458/files/15082553504.pdf
    • https://cdn.shopify.com/s/files/1/0440/4117/5190/files/72228375280.pdf
    • https://cdn.shopify.com/s/files/1/0436/5526/6457/files/wajubuvezo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32852202686.pdf
    • https://cdn.shopify.com/s/files/1/0438/0252/5856/files/769425304.pdf
    • https://cdn.shopify.com/s/files/1/0432/2492/4319/files/fowagupojegasoxogegizorad.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_off00006cdb.bin
7289d822d67db08bcb5b982cc62a06af433c8a5daf67d5149d38a3dd460841c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDB 5708 bytes
font_01_sfnt_off00008058.bin
376d9f131879546f243f2a215f72168094a327ce241c63803c16c643bd91271c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8058 9956 bytes

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