Malicious PDF — malware analysis report

Static analysis result for SHA-256 329616fbce292078…

MALICIOUS

PDF

45.0 KB Created: 2020-08-13 21:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a275255bb82e059052852e7d6268ea81 SHA-1: 5a2e6a1c346be35bdcb20c7bb945b3228d712657 SHA-256: 329616fbce29207829da9a9a8c330e8d76ed168dc961136538d0db9065847e8c
150 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific redirector URL that is flagged as malicious. The document body, though heavily obfuscated, contains the same redirector URL and keywords related to macOS Catalina, suggesting a lure to trick users into clicking the malicious link. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=mac+os+catalina++size
    • http://fobexudor.customgoggles.net/uploads/1/3/1/0/131070001/1479575.pdf
    • http://files.theliteraturefactory.com.au/uploads/1/3/0/8/130814042/juguweman.pdf
    • http://files.thewallssager.com/uploads/1/3/0/7/130775846/zofudaxeluzun-vogake.pdf
    • http://files.greaternewhopelr.org/uploads/1/3/1/4/131406663/6012994.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/lemeso.pdf
    • https://cdn.shopify.com/s/files/1/0431/5165/5076/files/47306952926.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/reragijod.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dobemajafapurotexujebo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8179/3698/files/fisioterapia_para_hernia_de_disco_lumbar.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/mijexorivimuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/6868/5464/files/85203952755.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5211/files/zebefupirexuxojejinobiti.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fiwowosilikaragufes.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_off00007300.bin
fa84644e4818ed116eda268e3f578fb2d9c27478488689ffbdb3ded6c1908252		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7300 4752 bytes
font_01_sfnt_off00008341.bin
d8674ea79c73f55acde1ff8897b32294d100e48e14c62836dfb408924137f4a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8341 10596 bytes

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