Malicious PDF — malware analysis report

Static analysis result for SHA-256 404cc627b665cb36…

MALICIOUS

PDF

51.8 KB Created: 2020-08-07 19:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2395a5c5d66f0abef4e2d06ab7806b74 SHA-1: e53d60b762b34a012b4ed463537c6676ae2103de SHA-256: 404cc627b665cb367758e0f2fc10c1c31892d703c2478d10daae147067b9e27e
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same malicious URL. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm or SEO poisoning attempt. The ML_NYX_PDF_MALICIOUS heuristic strongly indicates malicious intent.

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=blossoms+of+the+savannah+questions+pdf
    • http://files.thecircusdrummer.com/uploads/1/3/0/7/130739971/fiwife.pdf
    • http://files.universalmatrixhi.com/uploads/1/3/0/7/130776225/b8c3e.pdf
    • http://jegarakob.dsmtoolworks.com/uploads/1/3/1/4/131453674/fugevujajabi-navogopa-jevosebutof.pdf
    • https://cdn.shopify.com/s/files/1/0437/0087/9510/files/tezeferefuwu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7222/5442/files/wobuligivuxegiwexux.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7248/files/85270807940.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/41855322545.pdf
    • https://cdn.shopify.com/s/files/1/0431/6993/9607/files/gefipenuxanorugif.pdf
    • https://cdn.shopify.com/s/files/1/0428/6028/2023/files/navowaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jepomosojavadoji.pdf
    • https://cdn.shopify.com/s/files/1/0439/9906/8318/files/delete_branch_from_github.pdf
    • https://cdn.shopify.com/s/files/1/0432/7804/1244/files/50174128792.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2250/files/adobe_scan_ocr.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/36952353696.pdf
    • https://cdn.shopify.com/s/files/1/0439/7072/3998/files/vuvuvut.pdf
    • https://cdn.shopify.com/s/files/1/0434/9375/2997/files/71174249812.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/
    • https://cdn.shopify.com/s/files/1/0430/7222/544

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f4e.bin
f096069b79a2c7512e95c7e84dd8a3c7f83e47323b41c83832088242539ddaf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F4E 5300 bytes
font_01_sfnt_off00009135.bin
6784721a790b48cd5573b568271f883cb7aef36428997c0523854400c5625bb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9135 10172 bytes
font_02_sfnt_off0000b3c8.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C8 4324 bytes

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