Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae4995ecc5436eb…

MALICIOUS

PDF

43.4 KB Created: 2020-08-08 07:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1270cfe5b0a337e39e635e87f23fb1d7 SHA-1: 61012ebce29e8fb53147a74f16f609c53770bec2 SHA-256: 3ae4995ecc5436ebff422122ebda6cb4033b0e17815739407074c25b059fd45f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a critical heuristic for linking to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=que+estudia+la+genetica+molecular+pdf'. Additionally, it contains a large number of embedded links to external PDF files, identified as a PDF link farm. While many of these links point to benign Shopify domains, the presence of the malicious redirector indicates a likely attempt to lure users to malicious content. No scripts were extracted, and the document body is largely unreadable binary data, making the attack pattern primarily based on the embedded link structure.

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=que+estudia+la+genetica+molecular+pdf
    • http://sefajonib.prizmnails.com/uploads/1/3/1/4/131483254/8e16393c0081.pdf
    • http://files.duidelijkengels.nl/uploads/1/3/2/8/132814448/5404095.pdf
    • http://files.nevrapoint.com/uploads/1/3/2/7/132710717/7833480.pdf
    • https://cdn.shopify.com/s/files/1/0436/6044/3813/files/oxford_dictionary_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0437/1510/0840/files/international_business_level_strategies.pdf
    • https://cdn.shopify.com/s/files/1/0430/0632/8995/files/xokabizoboletisimor.pdf
    • https://cdn.shopify.com/s/files/1/0438/5567/5552/files/butivesakukusofefur.pdf
    • https://cdn.shopify.com/s/files/1/0429/9646/5823/files/zamawoxopip.pdf
    • https://cdn.shopify.com/s/files/1/0432/8390/6724/files/81435202893.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6703/files/dujukeleto.pdf
    • https://cdn.shopify.com/s/files/1/0428/9721/1558/files/sanitary_engineering_reviewer.pdf
    • https://cdn.shopify.com/s/files/1/0434/1301/2637/files/xiboroxa.pdf
    • https://cdn.shopify.com/s/files/1/0435/7275/6648/files/site_reliability_engineering_how_google_runs.pdf
    • https://cdn.shopify.com/s/files/1/0434/3722/8188/files/elektrik_arpmasna_yaklam.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_off000068ec.bin
4d3e23ea5ca299bae410d77cd1147b494574a3b8761710b70eaaeacc6adb0bce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68EC 5536 bytes
font_01_sfnt_off00007ba9.bin
cda37d5e3e1ddd045f5e8bb9078418f0c1d25309a0f549bbb52ef2f91bba5915		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA9 10800 bytes

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