Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3850a9dfe425335…

MALICIOUS

PDF

44.2 KB Created: 2020-08-29 09:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98df4daa722fa6039e8bb122bf6323ec SHA-1: 4e5c364426c9dadf9a9f2cadcb357b39a57e5005 SHA-256: a3850a9dfe4253355dcaecd5f1a9a25cae96c15e4a44bb4a406ff7e0aa871342
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a redirector link to a known malicious infrastructure. The document body, though partially corrupted, contains text related to 'Permis ec restriction 12500 kg' and the malicious URL. The presence of a mass external PDF link farm further supports the malicious intent, likely to distribute malicious content or phish users.

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/wix?keyword=permis+ec+restriction+12500+kg
    • https://cdn.shopify.com/s/files/1/0430/6783/4517/files/print_advertising_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0430/0200/3609/files/28567341689.pdf
    • https://cdn.shopify.com/s/files/1/0438/4312/5413/files/liquide_amniotique_definition.pdf
    • https://cdn.shopify.com/s/files/1/0430/5338/3833/files/rubitebavinuwiriko.pdf
    • https://cdn.shopify.com/s/files/1/0437/8935/3118/files/615307710.pdf
    • https://cdn.shopify.com/s/files/1/0435/7075/7791/files/81962166806.pdf
    • https://static.usrfiles.com/ugd/b8c837_9fe1553ecdae4eecb60b0f9f62da6e08.pdf
    • https://static.usrfiles.com/ugd/b8c837_aafbd17cb98245e3a07b59be7b774e56.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a693f8d12254f0483d4c006fc52c01d.pdf
    • https://static.usrfiles.com/ugd/b8c837_870e0e68e57640e58ff529effbee9e36.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ab2735ed65648c4a259943546cac86a.pdf
    • https://static.usrfiles.com/ugd/b8c837_b3c91d1cdd20489fab72408da3a639f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_42e5b609ae004ef4ba91df46bbae440d.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_off0000678e.bin
0d49e5e9dc63983bfe7f5bee1f44cae9427311a205bae25119477d7035988cb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x678E 5392 bytes
font_01_sfnt_off000079e4.bin
6e2de9d85876415bbf099b170f10a729755044ab4416ef2b1756ac96884694ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79E4 13304 bytes

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