Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf76630e53dde6d3…

MALICIOUS

PDF

40.1 KB Created: 2020-08-30 13:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc30f96007f5b25702d8a21d60df1f72 SHA-1: c605caad151189f1bafc103de768131cb1bd3556 SHA-256: bf76630e53dde6d32b08889485fd73a4cd19413fa03e323c078bcee7815ac496
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, including a critical redirector link to 'ttraff.cc'. The document body and embedded URLs suggest a lure related to 'millionaire teacher pdf', likely intended to drive traffic to malicious infrastructure. The ML classifier strongly indicated maliciousness.

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/wix?keyword=millionaire+teacher+pdf
    • https://cdn.shopify.com/s/files/1/0431/5398/1594/files/measurable_organizational_value.pdf
    • https://cdn.shopify.com/s/files/1/0431/6725/2629/files/42800266697.pdf
    • https://cdn.shopify.com/s/files/1/0440/8056/2326/files/93260496675.pdf
    • https://cdn.shopify.com/s/files/1/0438/3227/9190/files/satufewibuz.pdf
    • https://cdn.shopify.com/s/files/1/0447/9614/9921/files/thalapakattu_chicken_biryani_recipe_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5322/files/37579279673.pdf
    • https://cdn.shopify.com/s/files/1/0430/0174/1463/files/gudemudipodifumedabubaleg.pdf
    • https://cdn.shopify.com/s/files/1/0436/4071/7462/files/mini_rex_color_guide.pdf
    • https://static.usrfiles.com/ugd/c63dba_29baa743bb9c4ae9ade9f1a6c181be0e.pdf
    • https://static.usrfiles.com/ugd/c1de29_cfb35b4ae63546aca516a777bee5670a.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasamonuje.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/6999/files/6140082659.pdf
    • https://cdn.shopify.com/s/files/1/0429/9656/4131/files/suwuke.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4246/files/6467541317.pdf
    • https://cdn.shopify.com/s/files/1/0432/1548/7133/files/62566452775.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_off00005fe8.bin
663925a13b56f3ade039cb66d3dfa0b36d8af337cc02b34de1ca08f4db7cbecf
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE8 5072 bytes
font_01_sfnt_off00007121.bin
3b36076406a396ccfb1da1be093df4442e4f9d2c0a30d945df9bd353ccc7b11e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7121 10192 bytes