Malicious PDF — malware analysis report

Static analysis result for SHA-256 2779e03cd89c345a…

MALICIOUS

PDF

40.1 KB Created: 2020-08-29 23:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1fe84ee784517c27dd83794495a466e SHA-1: ec22d2a2ec258184c9687929d567264ad58da4be SHA-256: 2779e03cd89c345a9051b1595ede636412682d812e383cac9dbf0bc0de324be1
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a large link farm, indicating a likely SEO manipulation or redirection attack. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous external links, including one pointing to a known malicious redirector, suggests the primary attack vector is through these links, potentially leading to further compromise.

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/wix?keyword=normas+de+convivencia+positivas
    • https://cdn.shopify.com/s/files/1/0432/3042/9346/files/bejeweled_twist_game.pdf
    • https://cdn.shopify.com/s/files/1/0440/8446/1720/files/32113757330.pdf
    • https://cdn.shopify.com/s/files/1/0432/1994/3579/files/hc-_sr04_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/74712764253.pdf
    • https://static.usrfiles.com/ugd/b8c837_60789c81462d4bb8a0df1d37f5782e56.pdf
    • https://static.usrfiles.com/ugd/b8c837_3579f1eaa1a540fa988f446b4ca57a85.pdf
    • https://static.usrfiles.com/ugd/b8c837_db3253c0efc7482b895a918465f5b309.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8373fc8801e47aeabcc6c0299ed8792.pdf
    • https://static.usrfiles.com/ugd/b8c837_de8101c28447443aa733ff3c6c638ccb.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d2309370a324b2c9b9d451de9dedad4.pdf
    • https://static.usrfiles.com/ugd/b8c837_80c7413a27dc4850b3e9b38e144f2605.pdf
    • https://static.usrfiles.com/ugd/b8c837_8cf06fdd122449ec81ad31ad315fea58.pdf
    • https://static.usrfiles.com/ugd/b8c837_04eb9e0fcc4344748837390be136e3eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_82607e4ba07444f7a8f37e09c6aad2ac.pdf
    • https://static.usrfiles.com/ugd/3aca14_eef13ad8d2c048a1a6e2b14fe694bfa8.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_off00005fee.bin
dd3e430ae80d939bc359726cb88aa488a36fe616412ccd37a61522af2da7154a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEE 5216 bytes
font_01_sfnt_off00007197.bin
92ded274377ee2e85005d547b96193a2edc19ef88e0d8b5c8021a0b2d6c65e33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7197 10132 bytes

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