Malicious PDF — malware analysis report

Static analysis result for SHA-256 970c790696cd9db3…

MALICIOUS

PDF

43.0 KB Created: 2020-08-09 23:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5df563f4b8daea75722985cbc319df4 SHA-1: 5101d999b9af850ee7bdbef25749ba1ac15ab1a1 SHA-256: 970c790696cd9db32c1e47ea7986c39ccc916af1dbcd18d204cd4286b3e2ca05
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link disguised as a document about atherosclerosis. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the target URL and several other embedded URLs, many of which point to link farms hosted on Shopify. The primary malicious URL is https://ttraff.ru/pify?keyword=difference+between+atherosclerosis+and+arteriosclerosis+pdf, which is a known malicious redirector.

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=difference+between+atherosclerosis+and+arteriosclerosis+pdf
    • http://dotadofo.johnachten.com/uploads/1/3/1/3/131383664/133ec.pdf
    • http://files.seasmokepipesandpottery.com/uploads/1/3/1/4/131437423/377c2f.pdf
    • http://files.owius.org/uploads/1/3/0/8/130814209/lawabotugak-vajimilimid.pdf
    • http://files.cakesespecially.com/uploads/1/3/2/7/132710630/3dbd388.pdf
    • http://files.guiltygirlsgivinggroup.com/uploads/1/3/1/4/131482881/6416599.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6918/files/excel_vlookup_user_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/9811/2167/files/87151762093.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/naze32_rev_6_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/juborar.pdf
    • https://cdn.shopify.com/s/files/1/0433/5108/1118/files/all_important_days_in_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4155504299.pdf
    • https://cdn.shopify.com/s/files/1/0434/7723/7917/files/terrorismo_historia.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6917/files/respiration_minecraft_enchantment.pdf
    • https://cdn.shopify.com/s/files/1/0452/7587/3442/files/texas_accessibility_standards_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/8852/7013/files/wafotanotazupubiwitero.pdf
    • https://cdn.shopify.com/s/files/1/0430/7379/8298/files/76057171958.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_off0000669f.bin
d724a6602dca3329c6b4bde6c143f9187c3abe6f9f2d6011842e2367a2319c11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x669F 5472 bytes
font_01_sfnt_off0000794a.bin
317232aade9d90795be033ac1a4c306ac4384422a1f54b1480e52e6cfff3dba8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x794A 11020 bytes

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