Malicious PDF — malware analysis report

Static analysis result for SHA-256 452713ff2a295111…

MALICIOUS

PDF

45.2 KB Created: 2020-08-22 04:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b22a9df9acd980b32d6acfed9e9dd40a SHA-1: f79f865e09c9b23cb7ab95ab7b52d960513ab72a SHA-256: 452713ff2a295111c094538a777051aef77b43d738d186b0846c66606ac57929
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a reference to the malicious URL. The presence of a link farm and a high ML classifier score further indicate malicious intent. The primary attack pattern involves redirecting the user to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=general+chemistry+atomic+structure+worksheet+answers
    • http://gotatip.shearbalancesalon.com/uploads/1/3/1/6/131606552/vuzejowam_dorupemubokij_dowuvi_limole.pdf
    • http://files.p-over-p.com/uploads/1/3/2/6/132681199/3190258.pdf
    • http://files.miriamruberlartist.com/uploads/1/3/2/6/132682235/a151795c20.pdf
    • http://files.wandapayne.com/uploads/1/3/0/7/130739567/e9f4b5f19c4877c.pdf
    • http://files.humanrightsmalta.org/uploads/1/3/0/8/130814874/cf7c83179.pdf
    • https://cdn.shopify.com/s/files/1/0434/4646/8769/files/hallelujah_nuty_na_pianino.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5108/files/dexaxigemenazo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/eenadu_epaper_telangana_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/61675265648.pdf
    • https://cdn.shopify.com/s/files/1/0440/9350/5688/files/nafexepoduda.pdf
    • https://cdn.shopify.com/s/files/1/0435/3379/5477/files/biochemistry_text_books.pdf
    • https://cdn.shopify.com/s/files/1/0432/5844/5979/files/lodavibedumagesexa.pdf
    • https://cdn.shopify.com/s/files/1/0429/2447/4531/files/46013101162.pdf
    • https://cdn.shopify.com/s/files/1/0440/5461/0070/files/10_branches_of_psychology.pdf
    • https://cdn.shopify.com/s/files/1/0430/8621/7365/files/bokamomerirafa.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_off00007136.bin
a2d59333bf273e76acd3dc6a22b74cfb3a892572ab45ca6a443d8a749cb401e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7136 5328 bytes
font_01_sfnt_off00008340.bin
7241ca3f41d44e2f53955cbc98d96e612b3d15df91c76ca6bdc52d73798c7415		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8340 10540 bytes

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