Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f1d51351722964…

MALICIOUS

PDF

50.5 KB Created: 2020-08-31 12:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f2ee3cf2dd481013ffa826f056e8a6f SHA-1: a66f9a597e0d104ecea4b7f1200c0b65efe05700 SHA-256: e3f1d51351722964a2bf39850c398e660702eb58737bac93529fcb05ba4bc27a
152 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 numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.link/wix?keyword=do+aquifers+groundwater+and+watershe'. The document body, though heavily obfuscated, also contains this URL. The presence of a link farm suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.link/wix?keyword=do+aquifers+groundwater+and+watershe
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/99692068333.pdf
    • https://cdn.shopify.com/s/files/1/0437/6176/2455/files/lifojemufe.pdf
    • https://cdn.shopify.com/s/files/1/0432/1427/4720/files/acupressure_points_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/0537/0791/files/kajisojedaparob.pdf
    • https://cdn.shopify.com/s/files/1/0438/2729/8461/files/7056575493.pdf
    • https://static.usrfiles.com/ugd/2486b5_9300f82108774824842e4ab9e3118de0.pdf
    • https://static.usrfiles.com/ugd/cc14e4_c92cc4c5a091414badf3f003b5a1df9e.pdf
    • https://cdn.shopify.com/s/files/1/0430/1019/5605/files/43027083611.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vazakiliduvapi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0813/files/jurusitegusaraf.pdf
    • https://cdn.shopify.com/s/files/1/0431/1823/1709/files/73803625840.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_off000087fe.bin
e2090b47a1fc320061008951401959a63a237f0cf84cfb64f8396b2144be0291		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87FE 5352 bytes
font_01_sfnt_off00009a3a.bin
132cdcbf9ef77bb839286f2803958d98bdfb497079e0d9119a287629d580003a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A3A 10440 bytes

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