Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d95d2d2acde6aaf…

MALICIOUS

PDF

40.6 KB Created: 2020-03-23 04:11:08 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 20dc594cc833edd6d1929d25e86e9976 SHA-1: 2ae5511e2d45771f5e368786cbd854ed4a5553d1 SHA-256: 1d95d2d2acde6aaf8b97cb1cc2a8f6e1669d9873be59148b26ef7bb9cc346933
96 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are dynamically generated and point to other PDF files. The document body also contains a link to 'app-pof.com' disguised as search results. This indicates a likely SEO poisoning or link farm attack designed to drive traffic to malicious sites. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://app-pof.com/uploads/1/3/0/6/130621460/130621460.html#nascar+atlanta+race+2019+results
    • http://dragonfruitplanet.com/uploads/1/3/0/2/130291707/zitonesetifedarupab.pdf
    • http://hillcountryangelnetwork.com/uploads/1/3/0/6/130604177/645326.pdf
    • http://hackinghealthtech.com/uploads/1/3/0/5/130542773/e66ad7a94e965.pdf
    • http://www.rshscardinals75.com/uploads/1/3/0/6/130604392/219ba0cc5.pdf
    • http://hostmaster.cssltd.wales/uploads/1/3/0/4/130488123/zijopemaradusul.pdf
    • http://myhappyhare.com/uploads/1/3/0/6/130620929/zudorifogelozid.pdf
    • http://moodmetals.com/uploads/1/3/0/8/130814311/de1f6dc.pdf
    • http://sugarmaplemanagement.com/uploads/1/3/0/6/130620966/41e7ee165b.pdf
    • http://fortfamilyfoundationinc.org/uploads/1/3/0/2/130270991/1e0aa.pdf
    • http://www.realestatepract.com/uploads/1/3/0/2/130271158/libezum-monepi-lobevud-vaduso.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000797c.bin
4902a0d1942369981a1e3f9170da0e26f2c0fe6c47c0e40e6d182c7a5ed3f6b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x797C 7116 bytes

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