Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca307b71c9679f6a…

MALICIOUS

PDF

48.8 KB Created: 2020-07-31 03:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc1a288d23f82f745c42d10bd19ef575 SHA-1: 2fa02c7d0bcaf68163c43764d03a9eb2dc5c0560 SHA-256: ca307b71c9679f6aac5d641d4afc5cb4267579d8e2c0f71b93372d72da13bfe0
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK indicating a link to known malicious infrastructure. Another critical heuristic, PDF_SEO_LINK_FARM, suggests the document is part of a link farm designed for SEO manipulation. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily truncated and containing non-readable characters, includes a title related to drug absorption mechanisms, likely a lure.

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=mecanismos+de+absorcion+de+farmacos+pdf
    • http://files.mrddennis.com/uploads/1/3/1/3/131383541/71300e97b5d80.pdf
    • http://files.smilecommunicationsgroup.com/uploads/1/3/2/6/132681002/vebevemiru.pdf
    • http://files.commtechcorner.com/uploads/1/3/0/7/130739828/968141.pdf
    • http://files.mrdden
    • https://cdn.shopify.com/s/files/1/0431/6617/1296/files/turojeviwejojagudiba.pdf
    • https://cdn.shopify.com/s/files/1/0431/7777/1164/files/sexiriwanefomagu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3859/5482/files/bozajatatigufeboxoleba.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4830/files/sigejatedanenivol.pdf
    • https://cdn.shopify.com/s/files/1/0428/3373/9932/files/miviwesamanotagoluvor.pdf
    • https://cdn.shopify.com/s/files/1/0435/9464/5672/files/nujisojabugifibaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/9578/4600/files/13721095421.pdf
    • https://cdn.shopify.com/s/files/1/0438/6911/0432/files/50314942523.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/70238872234.pdf
    • https://cdn.shopify.com/s/files/1/0438/8130/0123/files/27569631369.pdf
    • https://cdn.shopify.com/s/files/1/0437/8935/3117/files/rovonozozebo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8210/4478/files/pinibete.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_off00007ed4.bin
5a956e66fd7c20097e4bc19d3f14a56d890265b1a48ebad127e94e7228977693		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED4 5124 bytes
font_01_sfnt_off0000900e.bin
1869c77e2436f561fee136978a1b1ec22759397d1adfb87b3916dd24b5a43128		 pdf-font-stream PDF embedded font (sfnt) at offset 0x900E 10928 bytes

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