Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d53787c46d55f5b…

MALICIOUS

PDF

37.4 KB Created: 2020-08-25 14:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cd88d76a5f318906019b2f784887420 SHA-1: 8b777ab9a5184fb44c675d37c0657a68a70ab726 SHA-256: 6d53787c46d55f5bfa21596d815bebf5557c18341bcef8bed1f0e94866787d42
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to direct users to malicious infrastructure. The ML classifier strongly indicated maliciousness, supporting the presence of a threat.

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.com/pify?keyword=scholastic+guided+reading+level+m
    • http://files.bscchicago.com/uploads/1/3/1/4/131453645/7940535.pdf
    • http://zofuge.craigheadresearch.org/uploads/1/3/0/8/130873965/verijepar_jopebowe_zifetobawa_ximenulowun.pdf
    • http://benusapi.yvonnegordonmoserart.com/uploads/1/3/2/8/132815758/mapagufaboj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0512/4503/files/little_black_boy_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0428/5494/0828/files/faxegos.pdf
    • https://cdn.shopify.com/s/files/1/0436/3590/0569/files/bribery_in_business.pdf
    • https://cdn.shopify.com/s/files/1/0435/9074/6271/files/www._fieldglass._net_timesheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/5326/0706/files/83431247739.pdf
    • https://cdn.shopify.com/s/files/1/0432/6955/4340/files/biconditional_proposition.pdf
    • https://cdn.shopify.com/s/files/1/0437/8312/7201/files/28487791929.pdf
    • https://cdn.shopify.com/s/files/1/0435/9713/6030/files/velako.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/angielski_w_tumaczeniach._sytuacje.pdf
    • https://cdn.shopify.com/s/files/1/0432/5202/3458/files/rolakuvilulixeroxakox.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42479515564.pdf
    • https://cdn.shopify.com/s/files/1/0430/7209/4362/files/59040923798.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000540f.bin
96bc01b38a0c8090855bb39815cd77d25e68a708d9add4b2d0d956f574263fde
pdf-font-stream PDF embedded font (sfnt) at offset 0x540F 5516 bytes
font_01_sfnt_off00006698.bin
dc814084fb2e85e8460901875daf3b283445941aa9069fc11674b28cb8db5600
pdf-font-stream PDF embedded font (sfnt) at offset 0x6698 10260 bytes