Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c364497227fe903…

MALICIOUS

PDF

34.1 KB Created: 2020-08-17 16:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12d7cdf2340567ebc652c9d79de0f9c1 SHA-1: b157efe71172e87a47090fe76c1744069970ae8e SHA-256: 3c364497227fe90344d786afed68737bd917e01452bac3e412abebb07142c49f
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same redirector URL. This suggests the PDF is designed to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted from this sample.

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=affidavit+of+continuous+marriage+florida+form
    • http://files.norforkschools.org/uploads/1/3/1/0/131070469/8278857.pdf
    • http://files.animatedboostudios.com/uploads/1/3/2/7/132710671/66bc606.pdf
    • https://cdn.shopify.com/s/files/1/0429/0091/4343/files/15922979757.pdf
    • https://cdn.shopify.com/s/files/1/0433/5609/4614/files/lambeth_north_area_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zijilo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3584/5017/files/vufunip.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/33971068516.pdf
    • https://cdn.shopify.com/s/files/1/0428/6359/1583/files/74881808783.pdf
    • https://cdn.shopify.com/s/files/1/0437/7663/9134/files/piano_music_for_ballet_class.pdf
    • https://cdn.shopify.com/s/files/1/0439/1455/9656/files/60872506762.pdf
    • https://cdn.shopify.com/s/files/1/0432/6876/7907/files/albertine_disparue_pdf.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004655.bin
ebfd69333b840222fc1ccfdb90456cef3129d8385624a19b2af971c26e52e2d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4655 5392 bytes
font_01_sfnt_off00005893.bin
d3d4f60cf70a4fa0e2edcb7155052d5ef578254a8797aafd2a21ee531c99caa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5893 9792 bytes

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