Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6508564863e2a7a…

MALICIOUS

PDF

38.6 KB Created: 2020-08-14 13:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09cd8f8783841c2dd8ab2bc8cb695774 SHA-1: f68e918641dca362081fa8058c149530259849a8 SHA-256: c6508564863e2a7a1ab3f25590078370c8c5245ef3208961c11e3a672d9ded43
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation or traffic redirection. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.cc/wb?keyword=buku%20toleransi%20beragama%20pdf`. The ML classifier also strongly indicated maliciousness. The document body text, though garbled, contains the same keywords as the malicious URL, reinforcing the lure.

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/wb?keyword=buku%20toleransi%20beragama%20pdf
    • http://files.littledragonsrugby.org/uploads/1/3/0/7/130738732/4dcaee2.pdf
    • http://vakab.happytrailtours.com/uploads/1/3/1/4/131413418/08feaa4b078852b.pdf
    • http://files.nxtgenerationenergy.com/uploads/1/3/2/7/132740415/sodegebu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9112/4643/files/bijogox.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3794/files/fonuludafovugovifetoxo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2635/7152/files/fowudovobi.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5221/files/99593550377.pdf
    • https://cdn.shopify.com/s/files/1/0450/2441/1806/files/94385585117.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99913566500.pdf
    • https://cdn.shopify.com/s/files/1/0445/6369/3732/files/nested_if_statements_python.pdf
    • https://cdn.shopify.com/s/files/1/0435/5493/0839/files/17879165907.pdf
    • https://cdn.shopify.com/s/files/1/0434/3375/4773/files/learning_styles.pdf
    • https://cdn.shopify.com/s/files/1/0433/4977/0399/files/11th_admission_form_format.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_off0000594f.bin
a59886beebc1012e9d961d3ccf73048d2cd0d8c7720c696a5ec6748264e98ed7
pdf-font-stream PDF embedded font (sfnt) at offset 0x594F 5612 bytes
font_01_sfnt_off00006c50.bin
4a50627fa70ee3900a7ef15fd51327c58d976a379e2a3ed5c7c98e185eec5a94
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C50 9800 bytes