Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e38e3f5835286e…

MALICIOUS

PDF

51.1 KB Created: 2020-08-17 13:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36e39f07db83848805d415ca94da7351 SHA-1: d26baaa2d222200bbaad60f33855072c9cb98c7b SHA-256: 42e38e3f5835286e90f75d8c1f4985ef686e0cc75eae8ab8061913f2e2741b9c
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to a link farm hosted on cdn.shopify.com, which is a common technique for SEO poisoning or distributing malicious content. One critical heuristic identified a direct link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=retinopatia+diabetica+diagnostico+pdf'. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and what appears to be metadata from wkhtmltopdf, suggesting it was programmatically generated to host these links.

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=retinopatia+diabetica+diagnostico+pdf
    • http://files.drawingfromtheday.com/uploads/1/3/1/4/131409309/5864599.pdf
    • http://files.crossfirerec.com/uploads/1/3/0/7/130739020/lugotedarov.pdf
    • http://files.rentalmonsters.com/uploads/1/3/0/7/130775734/vapikubalebaxe.pdf
    • http://files.ignaciocarballo.com/uploads/1/3/1/1/131164112/1998454.pdf
    • http://zutuxe.tidewatertrailanimal.com/uploads/1/3/0/7/130740019/c783db.pdf
    • https://cdn.shopify.com/s/files/1/0437/7578/7157/files/35120028336.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4977/files/25208160419.pdf
    • https://cdn.shopify.com/s/files/1/0439/0024/0024/files/46592621421.pdf
    • https://cdn.shopify.com/s/files/1/0441/2240/7064/files/83400303379.pdf
    • https://cdn.shopify.com/s/files/1/0435/2521/0263/files/algebra_1_textbook_answers.pdf
    • https://cdn.shopify.com/s/files/1/0447/1940/7257/files/defensoria_de_los_derechos_universitarios_unam.pdf
    • https://cdn.shopify.com/s/files/1/0446/3663/5299/files/trauma_life_support_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/5679/8613/files/kind_of_blue_zip.pdf
    • https://cdn.shopify.com/s/files/1/0428/2790/7239/files/vurixuxesokafitasukam.pdf
    • https://cdn.shopify.com/s/files/1/0438/6023/0294/files/elaboracion_de_talco_antimicotico.pdf
    • https://cdn.shopify.com/s/files/1/0438/3614/5814/files/73990164239.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_off000089a7.bin
b12073aebd71c7d6806afca3bd9068f9c5ae1a7601f1cce4aa1e986391891baf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89A7 5344 bytes
font_01_sfnt_off00009be6.bin
1744fcf9c8a28ba2541fe3ae9cbf50c12d0e35d1f719902b3aa58f4d6dc9a9a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BE6 10440 bytes

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