Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d0908f3d20f7680…

MALICIOUS

PDF

53.7 KB Created: 2020-08-18 14:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4d5ac81c0f072a08964361c390b3fd5 SHA-1: 656f0f6cf310ebc8136f0c1385a34b3db495253b SHA-256: 6d0908f3d20f7680054c83d10b4824e97c9b5e2c808836a6a07d0abe8526ebd2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to Shopify-hosted PDFs, which is indicative of a link farm or SEO poisoning attempt. One of the primary links directs to a known malicious redirector, suggesting a phishing or malware distribution scheme. The ML classifier strongly flagged this PDF as malicious.

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=sharp+aquos+tv+remote+android
    • http://files.chrashworks.com/uploads/1/3/1/3/131383510/c7592003a83ba.pdf
    • http://danipu.montemumford.com/uploads/1/3/0/9/130969772/9315265.pdf
    • http://files.adachiclinic.org/uploads/1/3/1/4/131437980/sanilo-tofudut-xonivuwaka.pdf
    • http://dufujusem.100daysofimp.com/uploads/1/3/0/7/130739964/5277180.pdf
    • http://files.mrsdawson-classroom.com/uploads/1/3/1/6/131637273/zidejukakeziba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0078/1208/files/dadepadu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8035/8815/files/ncert_biology_book_class_11_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/38971708790.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3481/files/jatokipa.pdf
    • https://cdn.shopify.com/s/files/1/0437/6405/6225/files/79664977215.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7187/files/tunet.pdf
    • https://cdn.shopify.com/s/files/1/0429/3450/1535/files/introduction_to_probability_and_statistics_nptel.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/ziminasebidologaxez.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e3c.bin
86c6a0ada9ae2cbef047a7ea48ffdd8b75d4f9c36e5a6af59b6b40fd264e16cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3C 5456 bytes
font_01_sfnt_off000080a1.bin
2102b1cbf29b47b0ab5d2bd3a785a4d76db687709d4859628eb45733217c5b64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80A1 5224 bytes
font_02_sfnt_off00008f62.bin
b500a65467a8d1783a7010408b97fbdd205e7e3e66f2ed4d3026c5526f7fc945		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F62 10384 bytes
font_03_sfnt_off0000b31d.bin
8d45f5f417e74c11d54eaee7138901bb4b2498e40dea16ccf89f2c2707c13e35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB31D 16544 bytes

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