Malicious PDF — malware analysis report

Static analysis result for SHA-256 2533e9d66874ccc0…

MALICIOUS

PDF

43.3 KB Created: 2020-08-04 01:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbb3cbbf9900cdae9ce4e017554ed2d3 SHA-1: 6c6e5843916d4beee2f8896d482716cd926f3889 SHA-256: 2533e9d66874ccc09d5014d077c5a45494c56abbcbdd5064ced91d558215d185
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 of which point to Shopify domains hosting other PDFs, but one critical link redirects to the known malicious domain ttraff.ru. This indicates a link farm or redirection scheme designed to lead users to malicious content. The ML classifier strongly supports the malicious verdict.

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.ru/pify?keyword=biblia+de+estudio+apologetica+holman+pdf
    • http://files.petspadogtrainer911.com/uploads/1/3/1/0/131071315/fesuwi.pdf
    • http://files.debbiecordeiro.com/uploads/1/3/1/4/131483153/e03a99.pdf
    • http://files.burbagenews.co.uk/uploads/1/3/1/8/131856046/6aee38.pdf
    • http://files.angelapearl.com/uploads/1/3/2/6/132681698/lemim-ginefowedobotov-ragexedir-lanufogumuxal.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/30232267790.pdf
    • https://cdn.shopify.com/s/files/1/0430/0875/3827/files/202169441.pdf
    • https://cdn.shopify.com/s/files/1/0431/0358/4409/files/pulejubirolituguwejexogod.pdf
    • https://cdn.shopify.com/s/files/1/0430/4030/9402/files/54130293370.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/vumeluni.pdf
    • https://cdn.shopify.com/s/files/1/0432/5831/4912/files/wozetifi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/bunokegazowirifu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7822/1973/files/vexibafeporigo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2775/1321/files/fuwupowaxixomef.pdf
    • https://cdn.shopify.com/s/files/1/0431/1888/7068/files/escape_from_tarkov_inventory_controls.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44411244229.pdf
    • https://cdn.shopify.com/s/files/1/0431/4395/4594/files/11957671849.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_off0000653e.bin
98801167bcff7ab8927ff1fe7bfd4d601f2f7b589a3b296c4201b22fe01a9616
pdf-font-stream PDF embedded font (sfnt) at offset 0x653E 5660 bytes
font_01_sfnt_off0000785c.bin
7fcf39f22de1bbee8654e87259ba8165d829d664626a733bfd062297022b0e50
pdf-font-stream PDF embedded font (sfnt) at offset 0x785C 11556 bytes