Malicious PDF — malware analysis report

Static analysis result for SHA-256 286e417f3aa3fab0…

MALICIOUS

PDF

57.6 KB Created: 2020-08-08 00:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 122446ac358c122e5e6cbf260ae31dd6 SHA-1: 0be6a611daeb4ee299a98f8a213243f20af0b7f1 SHA-256: 286e417f3aa3fab02a17f1d74892e0784a293abb840c04926c4ead9949d40348
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, forming a link farm. One of these links, https://ttraff.com/pify?keyword=look+back+in+anger+critical+analysis+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The ML classifier also 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.com/pify?keyword=look+back+in+anger+critical+analysis+pdf
    • http://files.iorinishioka.com/uploads/1/3/0/8/130874305/najijimese.pdf
    • http://files.katherinekeanportfolio.com/uploads/1/3/0/7/130776591/4921792.pdf
    • http://files.zenithfitnesstraining.com/uploads/1/3/2/6/132681823/lopisesu.pdf
    • http://rutas.adamoberman.net/uploads/1/3/0/8/130815017/jemeju-nanosukurumumo-rokirok-jorar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53551688275.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5944/files/solid_waste_management_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6327/files/654428358.pdf
    • https://cdn.shopify.com/s/files/1/0433/6055/1070/files/najuvasivudokaxetemizulud.pdf
    • https://cdn.shopify.com/s/files/1/0436/0349/3026/files/6488052739.pdf
    • https://cdn.shopify.com/s/files/1/0438/3545/7696/files/pdf_to_ms_word_converter_offline_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/2156/4066/files/gosudalosebozomovor.pdf
    • https://cdn.shopify.com/s/files/1/0430/6301/7629/files/17095825282.pdf
    • https://cdn.shopify.com/s/files/1/0432/1466/7936/files/zetagarigido.pdf
    • https://cdn.shopify.com/s/files/1/0429/2725/9811/files/kuxiduzowutenolab.pdf
    • https://cdn.shopify.com/s/files/1/0454/6953/2310/files/1000_frases_en_ingles_super_utiles_y_comunes.pdf
    • https://cdn.shopify.com/s/files/1/0429/3849/9235/files/vibokemule.pdf
    • https://cdn.shopify.com/s/files/1/0433/4357/7246/files/vilex.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_off000096a3.bin
6e8a37103568ee30554a5cf8b8463e2bee3519dc290fb0cd65d4ae6ed59a2afc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96A3 5360 bytes
font_01_sfnt_off0000a8ec.bin
04d72b49106d8b1f6ac82806e41e8331a781df02cac0896de32a11302869db45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8EC 9944 bytes
font_02_sfnt_off0000caea.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEA 4324 bytes

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