Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ab08cd2ddec456…

MALICIOUS

PDF

91.1 KB Created: 2020-08-06 18:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cecc479d3b976c176062be66374242f0 SHA-1: 42f89f8c11a1a7bfc8a0d3a450e1b629162aa697 SHA-256: b9ab08cd2ddec456470c0c719551b8d92b6d9aba1a2362f7dc26801c6ce3e5ee
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links, one of which, 'https://ttraff.cc/pify?keyword=biosecurity+act+2020+cth+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of a link farm heuristic further indicates an attempt to distribute malicious links.

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.cc/pify?keyword=biosecurity+act+2020+cth+pdf
    • http://files.tresjalapenos.com/uploads/1/3/2/8/132814220/2859742.pdf
    • http://files.wellbeinglifeus.com/uploads/1/3/0/8/130873877/0941072a0.pdf
    • http://files.charityrugbyleagueday.com.au/uploads/1/3/1/4/131411199/zaroruxiw_zupopeze_deverupirogefa_fekitatiz.pdf
    • http://files.destinycenterindy.com/uploads/1/3/1/6/131606954/verutiridefimi_vifaj_xafutupuwi_siwobixoseguwa.pdf
    • http://files.opentothedivine.com/uploads/1/3/1/4/131454238/1382281.pdf
    • https://cdn.shopify.com/s/files/1/0434/1969/7308/files/normativa_pesca_castilla_y_leon_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9673/files/lodiwok.pdf
    • https://cdn.shopify.com/s/files/1/0432/2502/2621/files/33272221276.pdf
    • https://cdn.shopify.com/s/files/1/0437/1621/4936/files/19673500147.pdf
    • https://cdn.shopify.com/s/files/1/0435/4146/3189/files/61233847331.pdf
    • https://cdn.shopify.com/s/files/1/0435/2973/2248/files/zutobukawakikawiranozuruj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0110/9920/files/84366324276.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/kajim.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/velinevimijipijozuwe.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6282/files/4238304407.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23063093424.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010be2.bin
84d9db1bc262debbbc377c38ecdfd129a296e40ea29cb4ae1006fefbe11f5c10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE2 5636 bytes
font_01_sfnt_off00011f14.bin
225f94244bc97e5084b879cc73a840bb724e37ee8ba5cd723736d1c8e38127ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F14 13112 bytes
font_02_sfnt_off000149dd.bin
116e1aefc1bdc9fdbdc8bc4ca32ed8fc2a9096b6ae60b76e258fcc2d5524df3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149DD 16112 bytes

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