Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ddeb8a6dbd2645…

MALICIOUS

PDF

45.7 KB Created: 2020-08-18 19:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c3244610275798082ce7c9632c79f0e SHA-1: 423bf2d29a70b4e75816837217197bd261b779c5 SHA-256: b4ddeb8a6dbd26452ed3a377e204033d93b8bf4343f4ff6989cb841c78f48b87
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic firing indicates a direct link to known malicious redirector infrastructure at ttraff.com. The document body, though corrupted, contains the URL https://ttraff.com/pify?keyword=spring+framework+5+release+zip, suggesting a lure related to software development. The primary attack pattern is to redirect users to malicious sites via these links.

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=spring+framework+5+release+zip
    • http://files.paulsumich.co.nz/uploads/1/3/0/7/130739831/zofiwifasojagit_xopipiladafuv.pdf
    • http://files.digbytrails.ca/uploads/1/3/0/8/130814676/f67caab469d28.pdf
    • http://files.worldtravelingfeet.com/uploads/1/3/1/3/131378990/9034742.pdf
    • http://pilobek.siklosphoto.com/uploads/1/3/2/6/132680869/vuzufemotomaki.pdf
    • https://cdn.shopify.com/s/files/1/0437/2774/9274/files/canevas_de_projet_de_developpement.pdf
    • https://cdn.shopify.com/s/files/1/0429/5426/0643/files/rafonikevavazow.pdf
    • https://cdn.shopify.com/s/files/1/0432/3577/0535/files/redstone_active_1_hours.pdf
    • https://cdn.shopify.com/s/files/1/0449/9714/8830/files/fumogilevava.pdf
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/environmental_impacts_of_genetically_modified_crops.pdf
    • https://cdn.shopify.com/s/files/1/0435/5863/3631/files/kuta_software_infinite_algebra_1.pdf
    • https://cdn.shopify.com/s/files/1/0437/7473/8586/files/energia_e_meio_ambiente_livro.pdf
    • https://cdn.shopify.com/s/files/1/0430/6557/3537/files/mazisazetugutupibenozofa.pdf
    • https://cdn.shopify.com/s/files/1/0437/0015/8629/files/mavoxeviwomesasalerepas.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_off00005662.bin
2df2dbbcb82711a95c97f7320068b06bf5360f3513aec1775ffc5e52ce70499c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5662 5656 bytes
font_01_sfnt_off000069b3.bin
c0dbc3eca1b4f527134e8926537628b86f8f38b60562ac8da02641b57b8d5b44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69B3 13272 bytes
font_02_sfnt_off0000930c.bin
43e84046d57c5d8edad47de9228ce36feb53c5e515436c294a71041590f3a3a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x930C 16132 bytes

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