Malicious PDF — malware analysis report

Static analysis result for SHA-256 8121621fdcd533c5…

MALICIOUS

PDF

52.2 KB Created: 2020-08-22 21:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d5d2cb8ac4842766ce65ac53c4e3bad SHA-1: 1a052b2eec454c35dc8001dd8120d69b1ec4c66d SHA-256: 8121621fdcd533c5d474eda80475b6c6f04d54af958ac507cdd154fe0e893418
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to domains that appear to be part of a link farm designed to improve search engine rankings. One prominent link, https://ttraff.ru/pify?keyword=guardian+crossword+answers+15424, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Guardian crossword answers', suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly supports the malicious nature of this PDF.

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=guardian+crossword+answers+15424
    • http://files.chriswellconsulting.com/uploads/1/3/1/4/131483830/duzufitugazijo.pdf
    • http://lapurapu.wendyfine.com/uploads/1/3/1/4/131407558/tejogoduwepudikijul.pdf
    • http://files.christinebushroman.com/uploads/1/3/0/8/130874254/a033d.pdf
    • http://files.texashollandlops.com/uploads/1/3/1/3/131379371/7953459.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/baal_veer_ka_video_ho_jaye.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/sadiwalu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0090/files/cartoon_movie_hd_apk.pdf
    • https://cdn.shopify.com/s/files/1/0436/5228/4566/files/kuwezubegefak.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/dizejojakuzot.pdf
    • https://cdn.shopify.com/s/files/1/0431/3825/2957/files/anticonvulsivantes_mecanismo_de_accion.pdf
    • https://cdn.shopify.com/s/files/1/0440/7446/7478/files/51173059162.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/72286446904.pdf
    • https://cdn.shopify.com/s/files/1/0432/1083/4077/files/import_script_to_tampermonkey.pdf
    • https://cdn.shopify.com/s/files/1/0430/6049/4490/files/394016738.pdf
    • https://cdn.shopify.com/s/files/1/0430/9513/0266/files/wugifajijow.pdf
    • https://cdn.shopify.com/s/files/1/0435/1734/5944/files/nakebatuxolemazik.pdf
    • https://cdn.shopify.com/s/files/1/0428/0382/2755/files/95386972318.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_off000080a8.bin
8dd5c1e7085236156389a5161e3ec36b86bbc7931b0a87e3d79caa853e9a6c35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80A8 5224 bytes
font_01_sfnt_off00009294.bin
fedb8c752a079455286de21dc09b5931a52d202f0815f99ea34df782e5474fe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9294 10192 bytes
font_02_sfnt_off0000b571.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB571 4324 bytes

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