Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ff0e80415e1588…

MALICIOUS

PDF

41.8 KB Created: 2020-08-25 15:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d19d88ca2395dd826a901cc539aaf06 SHA-1: 307978d48c9badf1c9cb908ba414b5ec32e3a280 SHA-256: 33ff0e80415e15885cf76428a331761d88afca847ce48127b95c2c8f2362c97d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.cc'. The document body also contains this URL, suggesting an attempt to trick the user into visiting a malicious site under the guise of accessing ledger templates. The presence of numerous Shopify links, while many are benign, contributes to a link farm pattern.

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=general+ledger+templates+in+excel
    • http://files.pssam.org/uploads/1/3/1/1/131164081/sulamuvepumuruvax.pdf
    • http://files.martayogahome.com/uploads/1/3/1/3/131384335/zefuzizo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/2623/4009/files/automating_boring_stuff_with_python.pdf
    • https://cdn.shopify.com/s/files/1/0436/5202/2430/files/xatakedo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6931/7020/files/rixudaxelufopizuxaxobo.pdf
    • https://cdn.shopify.com/s/files/1/0461/4573/2771/files/befijolevekug.pdf
    • https://cdn.shopify.com/s/files/1/0432/4609/2443/files/authentication_and_authorization_short_form.pdf
    • https://cdn.shopify.com/s/files/1/0427/8665/2316/files/1710713562.pdf
    • https://cdn.shopify.com/s/files/1/0428/5733/2895/files/93111894467.pdf
    • https://cdn.shopify.com/s/files/1/0464/5073/7320/files/gosufolowa.pdf
    • https://cdn.shopify.com/s/files/1/0437/9394/0641/files/mazuxemax.pdf
    • https://cdn.shopify.com/s/files/1/0434/4138/9720/files/6th_grade_social_studies_test.pdf
    • https://cdn.shopify.com/s/files/1/0461/3498/4857/files/87319069690.pdf
    • https://cdn.shopify.com/s/files/1/0433/2909/3800/files/aadhaar_application_form_download.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_off00006513.bin
1bc5dddb03ce4249ed05947ecbcd2f8cc9dff79959b9f34ba407209668c23629
pdf-font-stream PDF embedded font (sfnt) at offset 0x6513 5492 bytes
font_01_sfnt_off000077b0.bin
7693988530e7eccb61d53aee57cda6f17ed8b42e70d1e63e20d57791a080787f
pdf-font-stream PDF embedded font (sfnt) at offset 0x77B0 10060 bytes