Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b27cde8229ddd1…

MALICIOUS

PDF

47.6 KB Created: 2020-07-31 10:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d23fcfe225b6958497823fa11b2f2ffe SHA-1: c94bb4848bb74861b6804905bb7c127df09166b5 SHA-256: c6b27cde8229ddd10c42ef0aa0c6272866cd6fb3aeec20df0dd724dd4aabd2f5
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to a link farm hosted on Shopify. The primary malicious link, 'https://ttraff.cc/pify?keyword=applications+of+mathematics+in+various+fields+pdf', is identified as a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to 'applications of mathematics'.

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.cc/pify?keyword=applications+of+mathematics+in+various+fields+pdf
    • http://files.alvinmarinellc.com/uploads/1/3/1/4/131407572/tubekof.pdf
    • http://files.annmaglinte.com/uploads/1/3/0/7/130775649/3475149.pdf
    • http://files.flabbytoflabulousfiles.com/uploads/1/3/2/6/132695476/f727a2208ec.pdf
    • https://cdn.shopi
    • https://cdn.shopify.com/s/files/1/0429/4931/2666/files/tiziren.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3621/files/peveruwuwegivepibil.pdf
    • https://cdn.shopify.com/s/files/1/0437/6464/6037/files/pijoxasawogeratit.pdf
    • https://cdn.shopify.com/s/files/1/0433/2909/3784/files/ritanijosarililidugiti.pdf
    • https://cdn.shopify.com/s/files/1/0433/8214/5182/files/39846122692.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5340/files/zivazirifogotikofemo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0568/9504/files/66845535368.pdf
    • https://cdn.shopify.com/s/files/1/0433/4649/3605/files/31423368651.pdf
    • https://cdn.shopify.com/s/files/1/0433/4449/4750/files/piloruj.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/51855077048.pdf
    • https://cdn.shopify.com/s/files/1/0431/4310/2618/files/kuzedazivixovoxijapas.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_off00007cae.bin
ec29291cce39f137fa84fdf05fb2da0a620a72d719e591711e763aa9b89c1bcc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CAE 5328 bytes
font_01_sfnt_off00008e93.bin
6a71f056e4b7e0b21571af6e5da63603e24217792aafddca51881dd5f3372dc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E93 10492 bytes