Malicious PDF — malware analysis report

Static analysis result for SHA-256 519af987e43cd4fb…

MALICIOUS

PDF

44.9 KB Created: 2020-08-13 21:39:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7ab073013050767e9ca51c8a7db43c5 SHA-1: 7285080a496837e2ee6bda2f9941969b7600eaee SHA-256: 519af987e43cd4fbcf2b87e8fbeff2ee61330c8d28b330659bac9b5ef6dbb1db
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The embedded URL 'https://ttraff.cc/pify?keyword=alpha+helix+vs+beta+sheet+amino+acids' is a known malicious redirector. The document body, though heavily obfuscated, contains this URL and numerous other links, suggesting a lure or SEO manipulation tactic to drive traffic to malicious sites.

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=alpha+helix+vs+beta+sheet+amino+acids
    • http://files.ryansbill.com/uploads/1/3/2/6/132681916/vejapinona_wipifujudefuzob_gamope.pdf
    • http://files.heimler-international.com/uploads/1/3/1/0/131070561/9650110.pdf
    • http://files.mysmellysocks.com/uploads/1/3/1/6/131637362/wigokafadawok_vigurotekusel_mukadezuzaz_sodumotawed.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20116177671.pdf
    • https://cdn.shopify.com/s/files/1/0427/9179/6902/files/tozizixebelupidu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7261/files/ridulada.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8806/files/pidasupixinowetogaralakoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/2421/1354/files/zejidabonifeniz.pdf
    • https://cdn.shopify.com/s/files/1/0438/2484/0861/files/ruin_my_history.pdf
    • https://cdn.shopify.com/s/files/1/0432/0182/2875/files/xixafoxobusowudi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9714/6019/files/42729672188.pdf
    • https://cdn.shopify.com/s/files/1/0430/3391/9645/files/92880094798.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6107/files/dusotes.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/lcm_of_8_and_3.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_off00007047.bin
9206334cc008f2b76a70965e1a8e9106fd24c29aa7bfc909ce413f43eafe81f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7047 5472 bytes
font_01_sfnt_off000082bd.bin
321bbc1a3c3038dc4d0ba7a55e91e822dd61a1eca2aac9ef783cf2998ebbaf02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82BD 10700 bytes

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