Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f616fe1933145c4…

MALICIOUS

PDF

43.8 KB Created: 2020-10-28 04:53:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6aaf1f13f06f70a9fdf93cf8f93a033e SHA-1: 73ffdb5a3a667b895ead4aa719c5a9784d348c96 SHA-256: 5f616fe1933145c4c2dcd14ab506d8bbccb2887a875cff39969d270fc9e9f161
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, 'gettraff.ru', disguised within content that appears to be a grant cover letter. The PDF also hosts a large number of other PDF files, suggesting a link farm or SEO poisoning attempt to drive traffic to malicious infrastructure. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent.

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://gettraff.ru/123?keyword=grant+cover+letter
    • https://juzugimigiroteg.weebly.com/uploads/1/3/2/3/132302883/gukaxoxotegamakutapi.pdf
    • https://mobonojijokatu.weebly.com/uploads/1/3/4/3/134320628/6264e78.pdf
    • https://lifotuvuzaraxur.weebly.com/uploads/1/3/0/7/130775275/fewuzam-vesadinitejufib-fovewifejin.pdf
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/7379816.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0483/5757/2761/files/tuzefijiwejavasakobuniza.pdf
    • https://cdn.shopify.com/s/files/1/0501/2881/4273/files/genie_garage_door_opener_remote_programming_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0484/0371/0104/files/87163346362.pdf
    • https://cdn.shopify.com/s/files/1/0478/2873/0015/files/wakomanuwasadude.pdf
    • https://s3.amazonaws.com/henghuili-files2/internalization_theory.pdf
    • https://s3.amazonaws.com/jagux/kesudilewalikikij.pdf
    • https://s3.amazonaws.com/memul/medical_terminology_for_dummies.pdf
    • https://s3.amazonaws.com/kavitokolezub/nadejanarezobixuliser.pdf
    • https://uploads.strikinglycdn.com/files/6c5ce8af-e6df-4e96-8f83-afa5cefe9777/gozabokoxidoborevufed.pdf
    • https://uploads.strikinglycdn.com/files/d4a8fc0f-5617-4640-8c8f-a429267f0650/34334459068.pdf
    • https://uploads.strikinglycdn.com/files/29975b89-4497-40a8-bd56-e4370729f9f7/polinomios_exercicios_resolvidos_ensino_medio.pdf
    • https://uploads.strikinglycdn.com/files/eeb2609a-fb6d-40f7-a723-8fb5cda7dabe/mepumusubamag.pdf
    • https://uploads.strikinglycdn.com/files/144cbdef-ea83-4a99-94fd-8eacdc6e4cdb/xikumenomev.pdf
    • https://cdn.shopify.com/s/files/1/0502/1155/3473/files/xuloja.pdf
    • https://cdn.shopify.com/s/files/1/0480/7481/7693/files/kenobetomolidasofezu.pdf
    • https://cdn.shopify.com/s/files/1/0493/7534/6847/files/download_m_tix_apk_terbaru.pdf
    • https://cdn.shopify.com/s/files/1/0486/3875/4974/files/95784056002.pdf
    • https://cdn.shopify.com/s/files/1/0429/2499/8819/files/apk_obb_gta_3.pdf
    • https://uploads.strikinglycdn.com/files/c7369273-4a54-4d28-b2b9-c939ab3042f2/23796869908.pdf
    • https://uploads.strikinglycdn.com/files/93690e86-9f16-4bc2-aa06-d6a916e013e6/73290483832.pdf
    • https://uploads.strikinglycdn.com/files/15db44be-049a-4576-96ce-4f641d8a6eda/lulolosiwowofatiwa.pdf
    • https://uploads.strikinglycdn.com/files/623d5fff-896a-4166-9fee-b2fdbdfb0d70/8831189538.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f97.bin
d85371a5359b669b992d3c9aeaa69d9f5770072317078092fe7673ca36cfad47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F97 4704 bytes
font_01_sfnt_off00007fae.bin
86858806db91b5f5b49c0863b93168107fb6c8c3d5a1936f2ce5ab8c58671253		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FAE 10108 bytes

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