Malicious PDF — malware analysis report

Static analysis result for SHA-256 02c52cfb63cec701…

MALICIOUS

PDF

44.1 KB Created: 2020-08-17 04:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fe40da0c504b4806fe0b61219ea33d7 SHA-1: 0e83b31bfd8c4831bd853e4a13a4558e5e83f40a SHA-256: 02c52cfb63cec70140eaa79c03e67acdf2c11015f86223fac3dca1b9864d909c
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or SEO manipulation tactic. The presence of 'curl_send_post.pdf' and other similar filenames in the document text, along with the ML classifier's high confidence, strongly suggests malicious intent. The document body itself is heavily obfuscated but contains URLs that are also present in the heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=medianav+evolution+android+auto
    • http://zoteje.marleysk9kitchen.com/uploads/1/3/1/4/131452942/nopikexadogodagoz.pdf
    • http://files.nemarkayaks.com/uploads/1/3/0/8/130873927/987a2f856e9.pdf
    • http://wexuxubis.alquranmke.org/uploads/1/3/0/7/130740514/1043815.pdf
    • http://suxas.brockportjunioreagles.com/uploads/1/3/1/4/131438216/4491076.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/1509/2894/files/curl_send_post.pdf
    • https://cdn.shopify.com/s/files/1/0436/6126/3001/files/personal_bible_study_methods.pdf
    • https://cdn.shopify.com/s/files/1/0437/5746/9845/files/report_lost_bpi_atm_card.pdf
    • https://cdn.shopify.com/s/files/1/0434/1425/7820/files/16457889192.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekugoxozeritazol.pdf
    • https://cdn.shopify.com/s/files/1/0429/8014/7359/files/venoxawimotebikafabijaned.pdf
    • https://cdn.shopify.com/s/files/1/0439/2170/3067/files/24565641444.pdf
    • https://cdn.shopify.com/s/files/1/0433/6589/2264/files/7606463259.pdf
    • https://cdn.shopify.com/s/files/1/0438/0337/7824/files/tugozuxedetavijoxelivifil.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/66154139044.pdf
    • https://cdn.shopify.com/s/files/1/0432/3619/6507/files/79760989402.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3031/files/69638230447.pdf
    • https://cdn.shopify.com/s/files/1/0434/7514/0761/files/elementary_probability_theory.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://cdn.shopify.com/s/files/1/0436/61
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007085.bin
8edcd22ed955c76e18b41d842827e5caac67b3b0bc6962c43f8f1b9d53a703ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7085 4704 bytes
font_01_sfnt_off0000809d.bin
085007e9954c40cf99485787ec633e0ca8ad92d0106ef7e9aa18ba6957461af3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x809D 10088 bytes

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