Malicious PDF — malware analysis report

Static analysis result for SHA-256 440bf1cfa46a805a…

MALICIOUS

PDF

42.6 KB Created: 2020-09-01 07:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c896e06257f6e6831d749a0f48fd74b6 SHA-1: 77de49aaccb7a5f47de4b3518cc5c729feeab67f SHA-256: 440bf1cfa46a805aa942e359d8c1af521450437892222cd7de90b03b4c869011
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm, with one URL redirecting to known malicious infrastructure. The ML classifier also flagged this PDF with high confidence. The primary malicious intent appears to be directing users to potentially harmful content through a deceptive link farm strategy.

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.club/wix?keyword=langrisser+fire+dragon+guide
    • https://cdn.shopify.com/s/files/1/0431/8999/3636/files/differences_between_sociology_and_anthropology.pdf
    • https://cdn.shopify.com/s/files/1/0432/1814/1347/files/android_studio_arrayadapter_textview.pdf
    • https://cdn.shopify.com/s/files/1/0432/9229/5332/files/romukajaxus.pdf
    • https://cdn.shopify.com/s/files/1/0440/4976/0421/files/acca_f5_bpp_study_text_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/1360/3491/files/nuwup.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3494/files/bumoro.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xidegafizupewutuzu.pdf
    • https://static.usrfiles.com/ugd/defcb2_010bf85e0616475f8fd1f65b5da666ff.pdf
    • https://static.usrfiles.com/ugd/5926b4_f12db5efdc30495aa3d034d3daa974d9.pdf
    • https://static.usrfiles.com/ugd/20d83a_7310ec21badd49bca202a546b75970c3.pdf
    • https://static.usrfiles.com/ugd/eb4c03_742a76c638f5402a93e6efc2015fb9ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_36dc028a578e4d4e8fd0fceef4f97e2d.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_off000069a6.bin
513e976616a0dfc62179cad957ef3add520cc6535471857689cbdb565344b67d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A6 4984 bytes
font_01_sfnt_off00007aad.bin
298075214008815b133e6a636fda7a167482c7bb6d3f35543cb3c1ef0b1b8dcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AAD 10352 bytes

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