Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2e19b5e5d4a6e6…

MALICIOUS

PDF

45.0 KB Created: 2020-07-25 15:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 264113c657ef14bef81faffd3afe3392 SHA-1: 41275abb46b1e02480261a8d12e48a89f61b91eb SHA-256: df2e19b5e5d4a6e65aedcaa9174a7b7454e89c0f39bd5a545f2d7141fe60a485
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links, many of which point to a link farm hosted on Shopify. One of the embedded URLs, 'https://ttraff.ru/pify?keyword=html+formatter+remove+whitespace', is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf.

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=html+formatter+remove+whitespace
    • http://files.meadowrunholisticcounseling.com/uploads/1/3/1/3/131381003/751a2.pdf
    • http://files.comforttrainer.net/uploads/1/3/2/6/132681002/4312007.pdf
    • http://files.ammonitestudio.co.uk/uploads/1/3/0/7/130739462/3622862.pdf
    • http://files.rudolphsculpture.com/uploads/1/3/0/8/130814630/c955f85.pdf
    • http://files.impactdesign.co/uploads/1/3/1/1/131163634/kages-xolurumixen-zisuzoxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/5844/5979/files/89665587455.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lokilus.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/gabemesib.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/parisibudipaxetiwori.pdf
    • https://cdn.shopify.com/s/files/1/0434/5731/4983/files/94957979675.pdf
    • https://cdn.shopify.com/s/files/1/0430/3385/4103/files/vutejud.pdf
    • https://cdn.shopify.com/s/files/1/0430/1619/2153/files/86164099131.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0309/files/tuxezewazatozipoluwuk.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/xowugovasemuxas.pdf
    • https://cdn.shopify.com/s/files/1/0428/2325/4179/files/febajusetu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0641/9367/files/8683464798.pdf
    • https://cdn.shopify.com/s/files/1/0433/9492/4694/files/11023735906.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/notadenagefajofakiwu.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/
    • https://cdn.shopify.com/s/files/1/0428/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e52.bin
de99d4e99adeaa974c6f8a267788522d2ce112c95bdd0e8e969f753d41eeb309		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E52 5052 bytes
font_01_sfnt_off00007f8b.bin
6830aa5bc047767868eabe0886e3fd4eafca6a148ae1fc4c02b9648505433d87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F8B 11444 bytes

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